Monday, 29 February 2016

Java Tutorial : Java String(String Constant pool)- Playlist

Java Tutorial : Java String(String pool)


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Java Tutorial : Java String(String pool) 
StringTest.java
public class StringTest
{

    public static void main(String[] args)
    {
        String s1 = "Cat";
        String s2 = "Cat";
        String s3 = "Dog";
        String s4 = new String("Cat");

        System.out.println("s1 == s2 : " + (s1 == s2));
        System.out.println("s1 == s3 : " + (s1 == s3));
        System.out.println("s1 == s3 : " + (s1 == s4));
    }

}
Output
s1 == s2 : true
s1 == s3 : false
s1 == s3 : false
Click the below link to download the code:
https://sites.google.com/site/javaee4321/java/StringDemo_StringPool_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/StringDemo_StringPool_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/ae1c81370f840697c745970d52d13d8987910b41/BasicJava/StringDemo_StringPool_App/?at=master

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  • Java Tutorial : Java String(String Constant pool)


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    Java Tutorial : Java String(String Constant pool)
    StringTest.java
    public class StringTest
    {
    
        public static void main(String[] args)
        {
    
            String s1 = "Welcome";
            String s2 = "Welcome";// will not create new instance
    
             System.out.println("s1 == s2 :"+(s1==s2));
    
        }
    
    }
    
    Output
    s1 == s2 :true
    
    Click the below link to download the code:
    https://sites.google.com/site/javaee4321/java/StringDemo_StringConstantPool_App.zip?attredirects=0&d=1

    Github Link:
    https://github.com/ramram43210/Java/tree/master/BasicJava/StringDemo_StringConstantPool_App

    Bitbucket Link:
    https://bitbucket.org/ramram43210/java/src/ae1c81370f840697c745970d52d13d8987910b41/BasicJava/StringDemo_StringConstantPool_App/?at=master

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  • Java Tutorial : Java String(How to create String Object)


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    https://www.youtube.com/watch?v=ZYvzzTj-cJM&list=UUhwKlOVR041tngjerWxVccw

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    Java Tutorial : Java String(How to create String Object)
    Java Tutorial : Java String(How to create String Object)
    Java Tutorial : Java String(How to create String Object)
    StringTest.java
    public class StringTest
    {
    
        public static void main(String[] args)
        {
    
            String greeting = "Hello world";
            System.out.println("greeting = " + greeting);
    
            char[] helloArray =
            { 'h', 'e', 'l', 'l', 'o', '.' };
            String helloString = new String(helloArray);
            System.out.println("helloString = " + helloString);
    
            String welcomeString = new String("Welcome");
            System.out.println("welcomeString = " + welcomeString);
    
        }
    
    }
    
    Output
    greeting = Hello world
    helloString = hello.
    welcomeString = Welcome
    Refer:
    https://docs.oracle.com/javase/8/docs/api/index.html?java/lang/String.html
    
    
    Click the below link to download the code:
    https://sites.google.com/site/javaee4321/java/StringDemo_How%20to%20Create_App.zip?attredirects=0&d=1

    Github Link:
    https://github.com/ramram43210/Java/tree/master/BasicJava/StringDemo_How%20to%20Create_App

    Bitbucket Link:
    https://bitbucket.org/ramram43210/java/src/ae1c81370f840697c745970d52d13d8987910b41/BasicJava/StringDemo_How%20to%20Create_App/?at=master

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  • Friday, 26 February 2016

    Java Tutorial : Java String(What is an immutable object)


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    https://www.youtube.com/watch?v=tOESavjFzxA&list=UUhwKlOVR041tngjerWxVccw

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    Java Tutorial : Java String(What is an immutable object) 
    Person.java
    /*
     * Person is an immutable class. Person's 
     * state cannot be changed once it is created.
     * 
     * We can't subclass the final class and 
     * alter the behavior.
     */
    public final class Person
    {
    
        final String name;
    
        public Person(String name)
        {
            this.name = name;
        }
    
        public String getName()
        {
            return name;
        }
    
    }
    
    ImmutableTest.java
    public class ImmutableTest
    {
    
        public static void main(String[] args)
        {
    
            Person personObj = new Person("Peter");
            System.out.println(personObj.name);
            System.out.println(personObj.getName());
    
            //personObj.name = "Dave";
    
        }
    
    }
    
    Output
    Peter
    Peter
    
    Click the below link to download the code:
    https://sites.google.com/site/javaee4321/java/StringDemo_Immutable_App.zip?attredirects=0&d=1

    Github Link:
    https://github.com/ramram43210/Java/tree/master/BasicJava/StringDemo_Immutable_App

    Bitbucket Link:
    https://bitbucket.org/ramram43210/java/src/ec3cefb1e3f2c8e99780d56182501ac13735f589/BasicJava/StringDemo_Immutable_App/?at=master

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  • Thursday, 25 February 2016

    Java Tutorial : Java String - Playlist

    Java Tutorial : Java String

    Java Tutorial : Java wrapper class (Character - escape sequences)


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    Java Tutorial : Java wrapper class (Character - escape sequences) 
    Java Tutorial : Java wrapper class (Character - escape sequences) 
    EscapeSequenceTest.java
    public class EscapeSequenceTest
    {
    
        public static void main(String[] args)
        {
            System.out.println("\t he said \"Hello!\" to me.\n");
            
            System.out.println("\'Welcome\\");
    
        }
    
    }
    
    Output
         he said "Hello!" to me.
    
    'Welcome\
    
    Click the below link to download the code:
    https://sites.google.com/site/javaee4321/java/EscapeSequenceDemo_App.zip?attredirects=0&d=1

    Github Link:
    https://github.com/ramram43210/Java/tree/master/BasicJava/EscapeSequenceDemo_App

    Bitbucket Link:
    https://bitbucket.org/ramram43210/java/src/f04fb0b510d935a99056b97ab2ac51f619fac410/BasicJava/EscapeSequenceDemo_App/?at=master

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  • Java Tutorial : Java wrapper class (Character class methods)


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    https://www.youtube.com/watch?v=-Y2au3fZtp4&list=UUhwKlOVR041tngjerWxVccw

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    Java Tutorial : Java wrapper class (Character class methods)
    WrapperClassTest.java
    public class WrapperClassTest
    {
    
        public static void main(String[] args)
        {
            /*
             * Determines whether the specified char value is a
             * letter.
             */
            boolean isLetter = Character.isLetter('a');
            System.out.println("Character.isLetter('a') = " + isLetter);
    
            /*
             * Determines whether the specified char value is a
             * digit.
             */
            boolean isDigit = Character.isDigit('2');
            System.out.println("Character.isDigit('2')  = " + isDigit);
    
            /*
             * Determines whether the specified char value is
             * white space.
             */
            boolean isWhiteSpace = Character.isWhitespace(' ');
            System.out.println("Character.isWhitespace(' ')  = "
                    + isWhiteSpace);
    
            /*
             * Determines whether the specified char value is
             * uppercase.
             */
            boolean isUpperCase = Character.isUpperCase('A');
            System.out.println("Character.isUpperCase('A')  = "
                    + isUpperCase);
    
            /*
             * 
             * Determines whether the specified char value is
             * lowercase.
             */
            boolean isLowerCase = Character.isLowerCase('a');
            System.out.println("Character.isLowerCase('a')  = "
                    + isLowerCase);
    
            /*
             * Returns the uppercase form of the specified char
             * value.
             */
            System.out.println("Character.toUpperCase('m') = "
                    + Character.toUpperCase('m'));
    
            /*
             * Returns the lowercase form of the specified char
             * value.
             */
            System.out.println("Character.toLowerCase('B') = "
                    + Character.toLowerCase('B'));
    
            /*
             * Returns a String object representing the
             * specified character value — that is, a
             * one-character string.
             */
            String str = Character.toString('u');
            System.out.println("Character.toString('u') = " + str);
    
        }
    
    }
    
    Output
    Character.isLetter('a') = true
    Character.isDigit('2')  = true
    Character.isWhitespace(' ')  = true
    Character.isUpperCase('A')  = true
    Character.isLowerCase('a')  = true
    Character.toUpperCase('m') = M
    Character.toLowerCase('B') = b
    Character.toString('u') = u
    
    Refer: 
    https://docs.oracle.com/javase/8/docs/api/index.html?java/lang/Character.html

    Click the below link to download the code:
    https://sites.google.com/site/javaee4321/java/WrapperClassDemo_Character_methods_App.zip?attredirects=0&d=1

    Github Link:
    https://github.com/ramram43210/Java/tree/master/BasicJava/WrapperClassDemo_Character_methods_App

    Bitbucket Link:
    https://bitbucket.org/ramram43210/java/src/f04fb0b510d935a99056b97ab2ac51f619fac410/BasicJava/WrapperClassDemo_Character_methods_App/?at=master

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  • Tuesday, 23 February 2016

    Java Tutorial : Java wrapper class (Character) - Playlist

    Java Tutorial : Java wrapper class (Character)


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    https://www.youtube.com/watch?v=uHHb0bm0zVU&list=UUhwKlOVR041tngjerWxVccw

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    Java Tutorial : Java wrapper class (Character) 
    Java Tutorial : Java wrapper class (Character) 
    WrapperClassTest.java
    public class WrapperClassTest
    {
    
        public static void main(String[] args)
        {
            char ch = 'a';
            System.out.println("ch = " + ch);
    
            Character characterObj = new Character(ch);
            System.out.println("characterObj = " + characterObj);
    
            /*
             * If you pass a primitive char into a method that
             * expects an object, the compiler automatically
             * converts the char to a Character for you.This
             * feature is called autoboxing.
             */
            displayCharObj('c');
    
            /*
             * If you pass an object into a method that expects
             * an primitive char, the compiler automatically
             * converts the Character to a char for you.This
             * feature is called unboxing.
             */
    
            displayChar(new Character('z'));
    
        }
    
        public static void displayCharObj(Character characterObjParam)
        {
            System.out
                    .println("characterObjParam = " + characterObjParam);
        }
    
        public static void displayChar(char chParam)
        {
            System.out.println("chParam = " + chParam);
        }
    }
    
    Output
    ch = a
    characterObj = a
    characterObjParam = c
    chParam = z
    
    Click the below link to download the code:
    https://sites.google.com/site/javaee4321/java/WrapperClassDemo_Character_App.zip?attredirects=0&d=1

    Github Link:
    https://github.com/ramram43210/Java/tree/master/BasicJava/WrapperClassDemo_Character_App

    Bitbucket Link:
    https://bitbucket.org/ramram43210/java/src/9880b82016e29094f797cfa7ceb03441b567b426/BasicJava/WrapperClassDemo_Character_App/?at=master

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  • Java Tutorial : Java format (DecimalFormat class)


    Click here to watch in Youtube :
    https://www.youtube.com/watch?v=SiPUuR5UQpU&list=UUhwKlOVR041tngjerWxVccw

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    Java Tutorial : Java format (DecimalFormat class) 
    Java Tutorial : Java format (DecimalFormat class) 
    DecimalFormatDemo.java
    import java.text.DecimalFormat;
    
    public class DecimalFormatDemo
    {
    
        static public void customFormat(String pattern, double value)
        {
            DecimalFormat myFormatter = new DecimalFormat(pattern);
            String output = myFormatter.format(value);
            System.out.println(value + "  " + pattern + "  " + output);
        }
    
        static public void main(String[] args)
        {
    
            customFormat("###,###.###", 123456.789);
            customFormat("###.##", 123456.789);
            customFormat("000000.000", 123.78);
            customFormat("$###,###.###", 12345.67);
        }
    }
    
    Output
    123456.789  ###,###.###  123,456.789
    123456.789  ###.##  123456.79
    123.78  000000.000  000123.780
    12345.67  $###,###.###  $12,345.67
    
    Click the below link to download the code:
    https://sites.google.com/site/javaee4321/java/FormatDemo_DecimalFormat_App.zip?attredirects=0&d=1

    Github Link:
    https://github.com/ramram43210/Java/tree/master/BasicJava/FormatDemo_DecimalFormat_App

    Bitbucket Link:
    https://bitbucket.org/ramram43210/java/src/9880b82016e29094f797cfa7ceb03441b567b426/BasicJava/FormatDemo_DecimalFormat_App/?at=master

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  • Monday, 22 February 2016

    Java Tutorial : Java format and printf methods - Playlist

    Java Tutorial : Java format and printf methods(Converters and flags)


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    Java Tutorial : Java format and printf methods(Converters and flags) 
    Java Tutorial : Java format and printf methods(Converters and flags) 
    FormatNumericExample.java
    import java.util.Calendar;
    import java.util.Locale;
    
    public class FormatNumericExample
    {
    
        public static void main(String[] args)
        {
    
            long n = 461012;
            System.out.format("%d%n", n); // --> "461012"
            System.out.format("%08d%n", n); // --> "00461012"
            System.out.format("%+8d%n", n); // --> " +461012"
            System.out.format("%,8d%n", n); // --> " 461,012"
            System.out.format("%+,8d%n%n", n); // --> "+461,012"
    
            double pi = Math.PI;
    
            System.out.format("%f%n", pi); // --> "3.141593"
            System.out.format("%.3f%n", pi); // --> "3.142"
            System.out.format("%10.3f%n", pi); // -->
                                                // "     3.142"
            System.out.format("%-10.3f%n", pi); // --> "3.142"
            System.out.format(Locale.FRANCE, "%-10.4f%n%n", pi); // -->
                                                                    // "3,1416"
    
            Calendar c = Calendar.getInstance();
            System.out.format("%tB %te, %tY%n", c, c, c); // -->
                                                            // "May 29, 2006"
    
            System.out.format("%tl:%tM %tp%n", c, c, c); // -->
                                                            // "2:34 am"
    
            System.out.format("%tD%n", c); // --> "05/29/06"
    
        }
    }
    
    Output
    461012
    00461012
     +461012
     461,012
    +461,012
    
    3.141593
    3.142
         3.142
    3.142     
    3,1416    
    
    February 22, 2016
    12:08 pm
    02/22/16
    
    Click the below link to download the code:
    https://sites.google.com/site/javaee4321/java/FormatDemo_format_Converters_App.zip?attredirects=0&d=1

    Github Link:
    https://github.com/ramram43210/Java/tree/master/BasicJava/FormatDemo_format_Converters_App

    Bitbucket Link:
    https://bitbucket.org/ramram43210/java/src/d0559102086f9677d57877fbba43556aca45fc19/BasicJava/FormatDemo_format_Converters_App/?at=master

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  • Java Tutorial : Java format and printf methods


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    Java Tutorial : Java format and printf methods 
    Java Tutorial : Java format and printf methods 
    FormatNumericExample.java
    public class FormatNumericExample
    {
    
        public static void main(String[] args)
        {
    
            System.out.format("%s, %s", "Hello", "world");
    
            System.out.println("\n---------------------------");
    
            float floatVar = 90.8f;
            int intVar = 100;
            String stringVar = "Peter";
    
            System.out
                    .format("The value of the float variable is "
                            + "%f, while the value of the integer variable is %d, "
                            + "and the string is %s", floatVar, intVar,
                            stringVar);
    
        }
    }
    
    Output
    Hello, world
    ---------------------------
    The value of the float variable is 90.800003, while the value of the integer variable is 100, and the string is Peter
    
    PrintfNumericExample.java
    public class PrintfNumericExample
    {
    
        public static void main(String[] args)
        {
    
            System.out.printf("%s, %s", "Hello", "world");
    
            System.out.println("\n---------------------------");
    
            float floatVar = 90.8f;
            int intVar = 100;
            String stringVar = "Peter";
    
            System.out
                    .printf("The value of the float variable is "
                            + "%f, while the value of the integer variable is %d, "
                            + "and the string is %s", floatVar, intVar,
                            stringVar);
    
        }
    }
    
    Output
    Hello, world
    ---------------------------
    The value of the float variable is 90.800003, while the value of the integer variable is 100, and the string is Peter
    
    Click the below link to download the code:
    https://sites.google.com/site/javaee4321/java/FormatDemo_format_App.zip?attredirects=0&d=1

    Github Link:
    https://github.com/ramram43210/Java/tree/master/BasicJava/FormatDemo_format_App

    Bitbucket Link:
    https://bitbucket.org/ramram43210/java/src/d0559102086f9677d57877fbba43556aca45fc19/BasicJava/FormatDemo_format_App/?at=master

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