Java implementation of the indexOf method

KW.java

class KW
{
    public static void main(String args[])
    {
        String s="Hello World",s1="World",s2="Hellz";
        System.out.println(s.indexOf('o'));
        System.out.println(s.indexOf('o',5));
        System.out.println(s.indexOf(s1));
        System.out.println(s.indexOf('z'));
        System.out.println(s.indexOf(s2));
    }
}

Output

kodingwindow@kw:~$ javac KW.java
kodingwindow@kw:~$ java KW
4
7
6
-1
-1
kodingwindow@kw:~$

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