将JLabel包装在JScrollPane内部的JPanel中

Question

我的Java有点生疏,所以请耐心等待.我的GUI类中有一个方法调用另一个返回JList的类文件.我遇到的问题是从JList获取文本,你可以看到下面输出的一个例子

package com.example.tests;

import java.awt.Color;
import java.awt.Container;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

 import javax.swing.BorderFactory;
 import javax.swing.JButton;
 import javax.swing.JFrame;
 import javax.swing.JLabel;
 import javax.swing.JList;
 import javax.swing.JPanel;
 import javax.swing.JScrollPane;
 import javax.swing.JTextArea;
 import com.example.tests.IJ_runTestAFJ;
 public class GUI_v2 extends JFrame
 {  
private static final long serialVersionUID = 1L;
IJ_CommonSetup setup = new IJ_CommonSetup();


Container c;
JPanel panel;
JScrollPane userScrollPane, errorScrollPane, sysScrollPane;
JTextArea   tfUserError, tfSysError;

private JButton resetButton;
public  JList<String> errorList;


GUI_v2() 
{
    resetButton = new JButton();
    resetButton.setText("Click to populate TextArea");
    resetButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            try {
                //test.runTest_Login(stUserName,stPwd);
                updatePanel();
            } catch (Exception e1) {
                e1.printStackTrace();
            }
        }
    });

    panel = new JPanel();

    tfSysError = new JTextArea(10,33);
    tfSysError.setLineWrap(true);
    tfSysError.setEditable(false);
    tfSysError.setWrapStyleWord(false);
    sysScrollPane = new JScrollPane(tfSysError);
    sysScrollPane.setBorder(BorderFactory.createLineBorder(Color.black));

    panel.add(sysScrollPane);
    panel.add(resetButton);

    c = getContentPane();
    c.add(panel);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setVisible(true);
    setSize(400,250); //width, height
    setLocation(600,0);
    setResizable(false);
    validate();     
}//close GUI

/**
 * @param args the command line arguments
 */
public static void main(String args[]) {
    /* Create and display the form */
   EventQueue.invokeLater(new Runnable() {

        public void run() {
            new GUI_v2().setVisible(true);
        }
    });
}

public void updatePanel()
{       
    errorList = new JList<String>();
    errorList = setup.getErrorJList();
    tfSysError.append(errorList.getComponent(1).toString());
    validate();
}


}// end on class

IJ_CommonSetup.java

package com.example.tests;

import javax.swing.JLabel;
import javax.swing.JList;
public class IJ_CommonSetup{
/**
 * 
 */

public static String stError = new String();
public static JList<String> stJListError = new JList<String>();


public JList<String> getErrorJList(){
    String error1 = new String("TestTestTestTestTestTestTestTestTestTestTestTestTestTest ");
    String error2 = new String("ApplesApplesApplesApplesApplesApplesApplesApplesApplesApples ");
    JLabel newError1 = new JLabel();
    newError1.setText(error1);
    JLabel newError2 = new JLabel(error2);
    stJListError.add(newError1);
    stJListError.add(newError2);
            return stJListError;
}
}

Answer 1

我在将标签包裹在Scrollpane内部的面板中时遇到了一些麻烦.此时,如果添加到标签的字符串很长,则它与左边对齐,这很好,但是标签在面板外伸展,切断了字符串的末端.

• 用JTextArea(int, int)在JScrollPane

• setEditable(false) 对于 JTextArea

而不是JLabel添加到JPanel(in JScrollPane)