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

What do the following function returns?

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

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

What do the following function returns?

System.out.println(x.substring(1,5));

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"));

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

What do the following function returns?

System.out.println(x.equals(y));