What is different type of indexOf() method in String java example

What is different type of indexOf() method in String java example

public class Test {
        public static void main(String[] args) {       
            String st = new String("test string test here");
           
            int index = st.indexOf((int)'t');
            System.out.println(index);
           
            index = st.indexOf((int)'t', 5);
            System.out.println(index);
           
            index = st.indexOf("test");
            System.out.println(index);
           
            index = st.indexOf("test", 10);
            System.out.println(index);
        }
}

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