Examples of String manipulations in Java

public class StringExample
{ public static void main(String[] args)
 { String s1 = "Computer Science";
  int x = 307;
  String s2 = s1 + " " + x;
  String s3 = s2.substring(10,17);
  String s4 = "is fun";
  String s5 = s2 + s4;
  
  System.out.println("s1: " + s1);
  System.out.println("s2: " + s2);
  System.out.println("s3: " + s3);
  System.out.println("s4: " + s4);
  System.out.println("s5: " + s5);
  
  //showing effect of precedence
  
  x = 3;
  int y = 5;
  String s6 = x + y + "total";
  String s7 = "total " + x + y;
  String s8 = " " + x + y + "total";
  System.out.println("s6: " + s6);
  System.out.println("s7: " + s7);
  System.out.println("s8: " + s8);
 }
}