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Java Swing - 如何创建各种JFileChooser

jfilechooser 【jfilechooser】
我们想知道如何创建各种JFileChooser。
代码展示 运行结果 
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JOptionPane;

public class Main {

  public static void main(String[] args) {
    JFrame frame = new JFrame();
    JFileChooser fc = new JFileChooser();
    fc.setMultiSelectionEnabled(true);
    fc.setCurrentDirectory(new File("C:\\tmp"));
    JButton btn1 = new JButton("Show Dialog");
    btn1.addActionListener(e->fc.showDialog(frame, "Choose"));
    JButton btn2 = new JButton("Show Open Dialog");
    btn2.addActionListener(e -> {
      int retVal = fc.showOpenDialog(frame);
      if (retVal == JFileChooser.APPROVE_OPTION) {
        File[] selectedfiles = fc.getSelectedFiles();
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < selectedfiles.length; i++) {
          sb.append(selectedfiles[i].getName());
          sb.append("\n");
        }
        JOptionPane.showMessageDialog(frame, sb.toString());
      }
    });
    JButton btn3 = new JButton("Show Save Dialog");
    btn3.addActionListener(e -> fc.showSaveDialog(frame));
    Container pane = frame.getContentPane();
    pane.setLayout(new GridLayout(3, 1, 10, 10));
    pane.add(btn1);
    pane.add(btn2);
    pane.add(btn3);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.pack();
    frame.setVisible(true);
  }
}