String basics in a java

public class StringExample
{  
                         public static void main(String args[])
                         {  
                                                  String s1="The";//creating string by java string literal  
                                                  char ch[]={'s','k','n','s','c','o','e'};  
                                                  String s2=new String(ch);//converting char array to string  
                                                  String s3=new String("is excellent");                                                                                                    //creating java string by new keyword  
                                                  System.out.println(s1);  
                                                  System.out.println(s2);  
                                                  System.out.println(s3);  
                         }
}