java - 如何在java中创建没有额外方法的自定义组件？

Question

我已经为 Labels 创建了自定义类，它工作正常，但我想要的是。每当我从该类创建实例时，必须创建标签而不需要额外的可返回方法。

请看我的代码

class  CustomLabel {

        private  JLabel customLabel;

         public  CustomLabel() {
                createLabel();
         }

         private  void createLabel() {
                customLabel = new JLabel("Label test");
         }

         /*
           i do not want to return this                 
          */
          public JLabel getLabel() {
                  return customLabel;
          }

}

class  Booter {

        /*
            calling customLabel
          */
         void createUI() {
                CustomLabel customLabel = new CustomLabel();

                 JPanel jPanel = new JPanel();

                 // this is not working
                 jPanel.add(customLabel);
                 // but if i call extra method that inside customLabel
                 // it works fine but i do not want it
                 jPanel.add(customLabel.getLabel());
                 //i need to do same like java defined component like.
                 JLabel label = new JLabel("Test2");
                 jPanel.add(label); // its is not required getLabel or others
           }
}

Answer 1

如果您想使用它的构造函数直接创建它，您可以扩展类 JLabel:

import javax.swing.JLabel;

public class CustomLabel extends JLabel {

    public CustomLabel(String text) {
        super(text);
    }
}

然后在您的调用代码中，您可以这样做:

class Booter {

    void createUI() {
        CustomLabel customLabel = new CustomLabel("TEST TEXT");

        JPanel jPanel = new JPanel();
        JLabel label = new JLabel("Test2");
        jPanel.add(customLabel);
        jPanel.add(label);
    }
}