If:
String x = "Computer";
String y = "Applications";

What do the following function returns?

System.out.println(x.indexOf(x.charAt(4)));

Give the output of the following statements:

String x[] = {"SAMSUNG", "NOKIA", "SONY", "MICROMAX", "BLACKBERRY"};

System.out.println(x[1]);

If:
String x = "Computer";
String y = "Applications";

What do the following function returns?

System.out.println(y + x.substring(5));

Give the output of the following:

String n = "Computer Knowledge";
String m = "Computer Applications"; 
System.out.println(n.substring(0,8).concat(m.substring(9))); 
System.out.println(n.endsWith("e"));