这是我第一次来这里。
我正在编写一个 GUI 驱动的程序,它允许我对.txt
文件执行凯撒密码。
但是,在添加ActionListener
s 和ChangeListener
s 之前,我决定测试 GUI。这是我得到的:
这是代码:
package implementation;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class Frame extends JFrame{
public Frame(){
super("Caesar[E]");
this.setVisible(true);
this.setLocationRelativeTo(null);
/*Adding the options to GUI*/
factor.setPreferredSize(new Dimension(30,30));
JToolBar toolbar = new JToolBar();
radio.add(encrypt);
radio.add(decrypt);
toolbar.add(encrypt);
toolbar.add(decrypt);
toolbar.add(factor);
toolbar.setFloatable(false);
/*Adding the JTextArea for input*/
Box inputBound = Box.createHorizontalBox();
Box inputBound_text = Box.createVerticalBox();
Box inputBound_buttons = Box.createVerticalBox();
inputScroll.add(input);
inputScroll.setEnabled(true);
input.setEditable(true);
inputScroll.setBorder(BorderFactory.createTitledBorder("Text/File for Encryption/" +
"Decryption"));
inputBound_text.add(inputScroll);
inputBound_buttons.add(openFile);
inputBound_buttons.add(cancelFileInput);
inputBound.add(inputBound_text);
inputBound.add(Box.createHorizontalStrut(25));
inputBound.add(inputBound_buttons);
/*Adding JTextArea for output*/
Box outputBound = Box.createHorizontalBox();
Box outputBound_text = Box.createVerticalBox();
Box outputBound_buttons = Box.createVerticalBox();
outputScroll.add(output);
output.setEditable(true);
outputScroll.setBorder(BorderFactory.createTitledBorder("Text After Encryption" +
"/Decryption"));
outputBound_text.add(outputScroll);
outputBound_buttons.add(saveFile);
outputBound_buttons.add(send);
outputBound.add(outputBound_text);
outputBound.add(Box.createHorizontalStrut(25));
outputBound.add(outputBound_buttons);
outputBound.setSize(150, 200);
/*Adding JButton for performing the action*/
this.add(performAction,BorderLayout.SOUTH);
/*Adding the components to the Frame*/
Box outerBox = Box.createVerticalBox();
outerBox.add(toolbar,BorderLayout.NORTH);
outerBox.add(inputBound);
outerBox.add(outputBound);
this.add(outerBox);
this.setSize(500, 700);
}
boolean isFileInput = false;
boolean isEncrypt = true;
JButton performAction = new JButton("Encrypt!");
JButton openFile = new JButton("Open a File");
JButton cancelFileInput = new JButton("Cancel File Input");
JButton saveFile = new JButton("Save File");
JButton send = new JButton("Send");
JTextArea input = new JTextArea();
JTextArea output = new JTextArea();
JFileChooser chooser = new JFileChooser();
JScrollPane inputScroll = new JScrollPane();
JScrollPane outputScroll = new JScrollPane();
ButtonGroup radio = new ButtonGroup();
JRadioButton encrypt = new JRadioButton("Encrypt",true);
JRadioButton decrypt = new JRadioButton("Decrypt",false);
JSpinner factor = new JSpinner(new SpinnerNumberModel(1,1,26,1));
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable(){
@Override
public void run(){
new Frame();
}
});
}
}
你能告诉我如何解决如图所示的问题吗?
setPreferredSize()
,但如何确保我输入正确的尺寸而无需反复试验?