JDK6的新特性之十二:JTable的排序和过滤

原来的JTable基本上是只能显示数据，在JDK6新增了对JTable的排序和过滤功能，下面代码演示了这两个功能

/**
* @author WuLi
*/
public class JTableTester {
  static String data[][] = {
    {"China","Beijing","Chinese"},
    {"America","Washington","English"},
    {"Korea","Seoul","Korean"},
    {"Japan","Tokyo","Japanese"},
    {"France","Paris","French"},
    {"England","London","English"},
    {"Germany","Berlin","German"},
  };
  static String titles[] = {"Country","Capital","Language"};
  public static void main(String[] args) {    
DefaultTableModel m = new DefaultTableModel(data,titles);
    JTable t = new JTable(m);
    final TableRowSorter sorter = new TableRowSorter(m);
    t.setRowSorter(sorter); //为JTable设置排序器
   
    JScrollPane sPane = new JScrollPane();
    sPane.setViewportView(t);
   
    JPanel p = new JPanel();
    p.setLayout(new BoxLayout(p,BoxLayout.X_AXIS));
    JLabel l = new JLabel("Criteria:");
    final JTextField tf = new JTextField();
    JButton b = new JButton("Do Filter");
    p.add(l);
    p.add(tf);
    p.add(b);
    b.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
          if(tf.getText().length()==0){
            sorter.setRowFilter(null);
          }else{
            sorter.setRowFilter(RowFilter.regexFilter(tf.getText()));//为JTable设置基于正则表达式的过滤条件
          }
        }
    });
   
    JFrame f = new JFrame("JTable Sorting and Filtering");
    f.getContentPane().add(sPane,BorderLayout.CENTER);    
    f.getContentPane().add(p,BorderLayout.SOUTH);
    f.setSize(400,300);
    f.setVisible(true);
  }
}
运 行上面程序，单击JTable的某一个title，这个title对应的列就会按照升序/降序重新排列；在下面的Criteria文本框中输 入"ese"，点击"Do Filter"按钮，JTable将只显示带有"ese"字符串的行，也就是China和Japan两行，如果文本框里面什么都没有，点击"Do Filter"按钮，这时JTable会显示所有的行。

JDK6新特性之Compiler
创建Compiler.java和Hello.java
1.Compiler.java

import java.io.File;

import javax.tools.JavaCompiler;
import javax.tools.StandardJavaFileManager;
import javax.tools.ToolProvider;

public class Compiler {
  public static void main(String args[]) {
    try {
      JavaCompiler jc = ToolProvider.getSystemJavaCompiler();
      StandardJavaFileManager sjfm = jc.getStandardFileManager(null, null, null);
   
      File javaFile = new File("Hello.java");

      Iterable fileObjects = sjfm.getJavaFileObjects(javaFile);
      jc.getTask(null, sjfm, null, null, null, fileObjects).call();
      // Add more compilation tasks
      sjfm.close();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}

2.Hello.java

import java.util.Date;
public class Hello
{
  public String getHelloWorld()
  {
    return "现在的时间为："+new Date();
  }
}


编译运行即可，在工作目录下你会发现：Hello.class表示Compiler run OK.

很不错，挑个小毛病。
MenuItem edit = new MenuItem("Edit Text File");
        sendMail.addActionListener(new ActionListener() { //这里应该是edit.addActionListener
            public void actionPerformed(ActionEvent e) {
                edit();
            }
        });