Testng listener: MyTestNGListener error -The type MyTestNGListener must implement the inherited abstract method ITestLi

public class MyTestNGListener implements ITestListener{
public void ontestfailure(ITestResult result){
System.out.println(" test failed");
System.out.println(result.getName());
System.out.println(result.getStatus());
System.out.println(result.getThrowable().getMessage());

}
public void ontestsuccess(ITestResult result){
System.out.println("test passed" +result.getName());