Question

我正在努力学习使我的Java编程更进一步。我有大部分的基础知识，除了一个，这让我疯了。给我一个问题的是JComboBox。在我的示例代码中，我得到的编译错误是错误的构造，应该参数化。我在这里做错了什么？

http://docs.oracle.com/javase/7/docs/api/javax/swing/JComboBox.html#JComboBox（E []）

这是我想用JComboBox的方法，但它没有帮助我。再次感谢您的帮助。

import javax.swing.JFrame;
import javax.swing.JPanel;

import javax.swing.JComboBox;

public class Test extends JFrame {

  JPanel p=new JPanel();
  String choices[]={
    "Hello",
    "Hey",
    "How's it going?"
  };
  JComboBox cb=new JComboBox(choices);

  public static void main(String[] args) {
    new Test();
  }
  public Test() {
    super("Test");

    setSize(400,300);
    setResizable(true);
    setDefaultCloseOperation(EXIT_ON_CLOSE);

    p.add(cb);
    add(p);

    setVisible(true);
  }
}

错误消息是

3 warnings found:
File: /home/connor/Documents/Java Programming/test/Test.java  [line: 14]
Warning: javax.swing.JComboBox is a raw type. References to generic type
javax.swing.JComboBox<E> should be parameterized
File: /home/connor/Documents/Java Programming/test/Test.java  [line: 14]
Warning: Type safety: The constructor javax.swing.JComboBox(java.lang.Object[]) belongs
to the raw type javax.swing.JComboBox. References to generic type
javax.swing.JComboBox<E> should be parameterized
File: /home/connor/Documents/Java Programming/test/Test.java  [line: 14]
Warning: javax.swing.JComboBox is a raw type. References to generic type
javax.swing.JComboBox<E> should be parameterized

如何在Java SE 7中使用JComboBox（Swing）？

0 个答案: