java strings methods

/*
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 */
package lesson1;

/**
 *
 * @author pclab
 */
public class stringmethods {
    public static void main(String[] args)
    {
    String str1="Burger", str2="King";
    String str3="BURGER", str4="burger";

    System.out.println("Length of str1:"+str1.length());
    System.out.println("Length of str2:"+str2.length());

    System.out.println("Substring method:"+str4.substring(2, 6));
    System.out.println("Substring method:"+str3.substring(3));

    System.out.println("to lower case:"+str3.toLowerCase());
    System.out.println("to upper case:"+str4.toUpperCase());

    System.out.println("Equals method:"+str3.equals(str4));
    System.out.println("Equals Ignorecase mehod:"+str3.equalsIgnoreCase(str4));

    System.out.println("Index of a:"+str4.indexOf('a'));
    System.out.println("Last index of a:"+str4.lastIndexOf('a'));

    String str5 = str1 + " "+str2;
    System.out.println(str5);
    System.out.println("String 5 Length: "+str5.length());

    System.out.println(str3.compareTo(str4);
	System.out.println(str4.compareTo(str3);
	System.out.println(str3.compareTo(str3);

    }
}