What will be displayed and why?

public static boolean echo( int num){ System.out.println("\techo(" + num + ")"); return true; }

public static void main (String[] args) {

System.out.println("false &&");

if( false && echo( 0 ) ){ System.out.println( "\tfalse && echo(0)"); }else if( true && echo( 1 ) ){ System.out.println( "\ttrue && echo(1)"); }else{ System.out.println( "\telse"); }

System.out.println(); System.out.println("true &&"); if( true && echo( 2 ) ){ System.out.println( "\ttrue && echo(2)"); }else if( false && echo( 3 ) ){ System.out.println( "\tfalse && echo(3)"); }else{ System.out.println( "\telse"); }

System.out.println(); System.out.println("false ||"); if( false || echo( 3 ) ){ System.out.println( "\tfalse || echo(3)"); }else if( true || echo( 4 ) ){ System.out.println( "\ttrue || echo(4)"); }else{ System.out.println( "\telse"); }

System.out.println(); System.out.println("true ||"); if( true || echo( 1 ) ){ System.out.println( "\ttrue || echo(1)"); }else if( false || echo( 0 ) ){ System.out.println( "\tfalse || echo(0)"); }else{ System.out.println( "\telse"); }

}