方法重载

public class TestCode {       public void myMethod(String s) {        System.out.println("My String");    }        public void myMethod(Object o) {        System.out.println("My Object");    }        public void myMethod(char o) {        System.out.println("My char");    }        public static void main(String args[]){        TestCode t = new TestCode();        t.myMethod(null);    }}

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