Java Statement and Expression

Java Statement and Expression

  • Java statements appears inside the methods of the classes and they describe all activities of a Java program.
  • Expressions produce values as results and will be used as part of another expression or in a statement.
    Statement and Expression program example:
    public class General {
     public static void main(String[] args) {
      int a=0, b=0, x=0, y=35;
      System.out.print("a: " +a +" b: " +b);
      System.out.print(" x: " +x +" y: " +y +"\n");
      a = 9;
      b = 7;
      y = x = a+b;
      System.out.print("a: " +a +" b: " +b);
      System.out.print(" x: " +x +" y: " +y +"\n");
     }
    }
    The result will bee:
    a: 0 b: 0 x: 0 y: 35
    a: 9 b: 7 x: 16 y: 16
    
  • Although every statement in the block ({...}) must end with a semicolon, the block itself does not end with a semicolon.
  • Method calls, object allocations, and of course, mathematical expressions are examples of expressions.
    Expressions example:
    ...
    int size = 5;
    
     if ( size > 10 )
        doSomething(  );
    
     for( int x = 0; x < size; x++ ) { ... }
    ...
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