Android:NullPointerException:尝试在空对象引用[duplicate]上调用接口方法

public class ExampleActivity extends AppCompatActivity {

    private MyInterface myObject;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_example);

        // 初始化对象
        myObject = new MyInterfaceImpl();

        // 调用方法前检查对象是否为空
        if (myObject != null) {
            myObject.doSomething();
        } else {
            Log.e("ExampleActivity", "myObject is null");
        }
    }
}

interface MyInterface {
    void doSomething();
}

class MyInterfaceImpl implements MyInterface {
    @Override
    public void doSomething() {
        // 实现接口方法
    }
}