public class OprationsOfString{
public static void main(String args[]){
String s1="Hello Java!";
String s2="el";
System.out.println("ַs1Ϊ"+s1);
System.out.println("ַs1ĳΪ"+s1.length());
System.out.println("ַs1ĴдʽΪ"+s1.toUpperCase());
System.out.println("ַs2СдʽΪ"+s2.toLowerCase());
for(int i=0;i<s1.length();i++){
System.out.println("s1еĵ"+i+"ַǣ"+s1.charAt(i));
}
System.out.println("s1+s2="+s1+s2);
if(s1.compareTo(s2)==0)
System.out.println("ַs1s2");
else
System.out.println("ַs1s2");
if(s1.indexOf(s2)!=-1){
  		System.out.println("ַs2s1Ӵ");
  		System.out.println("ַs2s1еλǣ"+s1.indexOf(s2));
}
else
System.out.println("ַs2s1Ӵ");
System.out.println("");
System.out.println("ַs1ȻΪ"+s1);
System.out.println("ַs2ȻΪ"+s2);
}
}