Big example to demonstrate string class methods

package stringclass;

public class StringClassMethods {

    
    public static void main(String[] args) {
        String s1= new String (" String 1");
        String s2 = " String 2" , s3 = " String 2";
        // length method returns the length of string
        System.out.println("s2.length()  =" + s2.length());
        //Returns the character at the specified index
        System.out.println("s2.CharAt(1)  =" + s2.charAt(4));
        //getChars(int srcBegin,int srcEnd,char[] dst,int dstBegin)
        char c[] = new char[s1.length()];
        s1.getChars(0,s1.length(),c,0);
        int i;
        //printout the chars that are copied
        for(i=0;i <c.length;i++)
            System.out.print(c[i]);
        System.out.println();

        //public byte[] getBytes()
        byte b[] = s1.getBytes();
        for(i=0;i <b.length;i++)
            System.out.print(b[i]+"  ");
        System.out.println();
    
        //boolean equals(Object anObject)
        Object o = new Object();
        System.out.println("o.toString()  =" + o + "  s1.toString() ="+s1.toString());
        System.out.println("s1.equals(o)  =" + s1.equals(o));
        
        //boolean equalsIgnoreCase(String anotherString)
        System.out.println("s1.equalsIgnoreCase = "+ s1.equalsIgnoreCase(" sTRing 1"));
        
        //int compareTo(String anotherString)
        System.out.println("zz compared to a = "+ "zz".compareTo("a"));

        //public boolean regionMatches(int toffset,String other,int ooffset,int len)
        System.out.println("regionMatches "+ "abcabcabc".regionMatches(0,"abc",0,3));

        //regionMatches(boolean ignoreCase,..) can be used to match regions by ignoring case

        //startsWith(String prefix,int toffset)
        System.out.println("startsWith "+ "abcabcabc".startsWith("abc",0));
        
        //hashCode()
        System.out.println("abc.hashCode() "+ "abc".hashCode());
        
        //int indexOf(int ch)
        System.out.println("abc.indexOf('c') "+ "abc".indexOf('c'));

        //int lastIndexOf(int ch,int fromIndex)
        System.out.println("abccccc.lastIndexOf('c',4) "+ "abccccc".lastIndexOf('c',4));

        //int indexOf(String str)
        System.out.println("abcabc.indexOf bc "+ "abcabc".indexOf("bc"));

        //String substring(int beginIndex,int endIndex)
        String sub = "iNetSolv".substring(2,7);
        System.out.println("sub = "+ sub);

        //trim

        System.out.println(" string1 after trimming = " + s1.trim());
        
        //concat

        System.out.println(" after contating s1 with s2 " + s1.concat(s2));

        //static String valueOf(char[] data)
        System.out.println(" String constructed using valueof method" + String.valueOf(c));

        System.out.println(" String constructed using valueof(float)" + String.valueOf(100.00F));
    
        // public String intern() , very intresting method
        //All literal strings and string-valued constant expressions are interned. 
        String si = s1.intern();
            System.out.println(" si == s1 " + (si==s1));
        String s10 = "literal";
        String s11 = s10.intern();
            System.out.println(" s10 == s11 " + (s10==s11));
        String a = new String(s1);
            System.out.println(" a == s1 " + (a==s1));
    }

}


output:
s2.length()  =9
s2.CharAt(1)  =i
 String 1
32  83  116  114  105  110  103  32  49  
o.toString()  =java.lang.Object@3e25a5  s1.toString() = String 1
s1.equals(o)  =false
s1.equalsIgnoreCase = true
zz compared to a = 25
regionMatches true
startsWith true
abc.hashCode() 96354
abc.indexOf('c') 2
abccccc.lastIndexOf('c',4) 4
abcabc.indexOf bc 1
sub = etSol
 string1 after trimming = String 1
 after contating s1 with s2  String 1 String 2
 String constructed using valueof method String 1
 String constructed using valueof(float)100.0
 si == s1 false
 s10 == s11 true
 a == s1 false