Java Assignment Operator Example

class OperatorExample{  

   public static void main(String args[]){  

      int a=10;  

      int b=20;  

      a+=4;//a=a+4 (a=10+4)  

      b-=4;//b=b-4 (b=20-4)  

      System.out.println(a);  

      System.out.println(b);  

   }

}

--------------------------------------------

Output:

14

16

Java Assignment Operator Example: Adding short

class OperatorExample{  

   public static void main(String args[]){  

      short a=10;  

      short b=10;  

      //a+=b;//a=a+b internally so fine  

      a=a+b;  

      System.out.println(a);  

   }

}

--------------------------------------------

Output:

Compile time error

class OperatorExample{  

   public static void main(String args[]){  

      short a=10;  

      short b=10;  

      a=(short)(a+b);//20 

      System.out.println(a);  

   }

}

--------------------------------------------

Output:

20

Java If-else Statement

if statement
if-else statement
nested if statement
if-else-if ladder

Java IF Statement

Syntax:

if(condition) {  

    //code to be executed  

}

public class IfExample {  

   public static void main(String[] args) {  

      int age = 20;  

      if (age > 18) {  

         System.out.print("Age is greater than 18");  

      }  

   }  

}

--------------------------------------------

Output:

Age is greater than 18

Java IF-else Statement

Syntax:

if (condition) {  

   //code if condition is true  

} else {  

   //code if condition is false  

}

public class IfElseExample {  

   public static void main(String[] args) {  

      int number = 13;  

      if(number % 2 == 0){  

         System.out.println("even number");  

      }else{  

         System.out.println("odd number");  

      }  

   }  

}

--------------------------------------------

Output:

odd number

Java IF-else-if ladder Statement

Syntax:

if(condition1){  

   //code to be executed if condition1 is true  

} else if(condition2){  

   //code to be executed if condition2 is true  

} else if(condition3){  

   //code to be executed if condition3 is true  

}  

...  

else{  

   //code to be executed if all the conditions are 

   //false

}

public class IfElseIfExample {  

  public static void main(String[] args) {  

    int marks = 65;  

    if(marks < 50){  

        System.out.println("fail");  

    }  

    else if(marks >= 50 && marks < 60){  

        System.out.println("D grade");  

    }  

    else if(marks >= 60 && marks < 70){  

        System.out.println("C grade");  

    }  

    else if(marks >= 70 && marks < 80){  

        System.out.println("B grade");  

    }  

    else if(marks >= 80 && marks < 90){  

        System.out.println("A grade");  

    }else if(marks >= 90 && marks < 100){  

        System.out.println("A+ grade");  

    }else{  

        System.out.println("Invalid!");  

    }  

  }  

}

--------------------------------------------

Output:

C grade

Java Switch Statement

Syntax:

switch(expression){    

   case value1:    

      //code to be executed;    

      break;  //optional  

   case value2:    

      //code to be executed;    

      break;  //optional  

   ......    

   default:     

      //code to be executed if all cases are not matched;    

}

public class SwitchExample {  

   public static void main(String[] args) {  

      int number=20;  

      switch(number){  

         case 10: 

            System.out.println("10");

            break;  

         case 20: 

            System.out.println("20");

            break;  

         case 30: 

            System.out.println("30");

            break;  

         default:

            System.out.println("Not in 10, 20 or 30");  

      }  

   }  

}  

--------------------------------------------

Output:

20

public class SwitchExample2 {  

   public static void main(String[] args) {  

      int number=20;  

      switch(number){  

         case 10: 

            System.out.println("10");  

         case 20: 

            System.out.println("20");  

         case 30: 

            System.out.println("30");  

         default:

            System.out.println("Not in 10, 20 or 30");  

      }  

   }  

}

--------------------------------------------

Output:

20

30

Not in 10, 20 or 30

Java For Loop

Java Simple For Loop

Syntax:

for(initialization;condition;incr/decr){  

   //code to be executed  

}

public class ForExample {  

   public static void main(String[] args) {  

      for(int i=1;i<=10;i++){  

         System.out.println(i);  

      }  

   }  

}

--------------------------------------------

Output:

1

2

3

4

5

6

7

8

9

10

Infinitive For Loop

public class ForExample {  

   public static void main(String[] args) {  

      for(;;){  

         System.out.println("infinitive loop");  

      }  

   }  

}

--------------------------------------------

Output:

infinitive loop

infinitive loop

infinitive loop

infinitive loop

infinitive loop

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