构造函数调用必须是 super() 构造函数中的第一条语句

Question

I'm following a guide on how to create a working interface in Java and I've done the code according to the guide yet I get an error saying Constructor call must be the first statement in a constructor , even though it is the first statement. I tried multiple solutions so I'm quite lost as none of them worked.

import java.awt.FlowLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class test extends JFrame {                  
    private JLabel item1;
    private void test () {
        super ("Title 1"); //error happens here     
      }
}

Answer 1

You didn't create a constructor - constructors don't have return type of void. It should be

private test (){  
    super ("Title 1");  
} 

but you actually should stick to Java naming conventions and rename your class to Test .

Answer 2

The constructor should not have a return value

private test () {
    super(); // This should do
}

Answer 3

You need to remove the void from your test function.

Your code must be like:

public test (){
    super ("Frame Title");
}