1. Create new class ClassA:

//----------------------------
public class ClassA{

    public ClassA() {
    }
    
    public void m1(){
        ClassA cA = new ClassA();
    }
    
}
//----------------------------

2. Put caret over constructor "ClassA"

3. invoke Refactor->Change Method Parameters... action from the popup menu.

4. In the Change Method Parameters dialog press the Add button and fill Type and Name for the new created parameter as int and id. Leave Default Value field empty.

5. Press Refactor button and you'll get this code:


//----------------------------
public class ClassA{

    public ClassA(int id) {
    }
    
    public void m1(){
        ClassA cA = new ClassA(null);
    }
    
}
//----------------------------

-> it causess the error at line "... = new ClassA(null)": incompatible types: <null> cannot be converted to int