[英]Java Swing JComboBox/ Button edit parameters
我對使用Java中的GUI很陌生。 我正在嘗試幾種方法,例如,在run方法中使用以下命令將新條目添加到JComboBox或更改JButtons標題:
pwSelection.addItem(“ Name 1”);
dec_btn.setText(“ Example”);
受保護的JComboBox pwSelection =新的JComboBox(內容);
不幸的是,我啟動程序后,沒有任何效果。 布局是使用IntelliJ GUI Form Creator創建的。 如果您能給我任何提示或替代方法,那將是很棒的。
package PackMain;
import javax.swing.*;
public class Password {
String[] contents = {"Name 1", "Name 2"};
protected JTextField newAdress;
protected JPanel panel1;
protected JComboBox pwSelection = new JComboBox(contents); // ?
protected JLabel title;
protected JTextField pwOutput;
protected JButton enc_btn;
protected JButton dec_btn;
public JFrame run(){
JFrame mainFrame= new JFrame ("Password");
mainFrame.setContentPane(new Password().panel1);
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainFrame.pack();
mainFrame.setLocationRelativeTo(null);
mainFrame.setSize(400, 200);
mainFrame.setResizable(false);
mainFrame.setVisible(true);
pwSelection.addItem("Name 1");
dec_btn.setText("Example");
return mainFrame;
}
public static void main(String[] args){
new Password().run();
}
}
panel1從未被定義為新的JPanel(),因此它為null,並且從未將所有其他組件(pwSelection,title等)添加到panel1中。
您沒有在框架中添加任何面板,也沒有初始化任何屬性...
package password;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import javax.swing.*;
public class Password extends JFrame{
String[] contents = {"Name 1", "Name 2"};
protected JTextField newAdress;
protected JPanel panel1, panel2; //2 panels for a more organized approach...
protected JComboBox pwSelection;// ?
protected JTextField pwOutput;
protected JButton enc_btn;
protected JButton dec_btn;
public Password(){ //Constructor of the class, initialize stuff here...
super("Shinny title");
//1. Initialize all your atributtes...
newAdress = new JTextField();
panel1 = new JPanel();
panel2 = new JPanel();
pwSelection = new JComboBox(contents);
pwOutput= new JTextField();
enc_btn = new JButton("First button");
dec_btn = new JButton("Second Button");
//Set layouts..
panel1.setLayout(new GridLayout(3,1));
panel2.setLayout(new FlowLayout());
//Add items to panel 1...
panel1.add(new JLabel("Adress:")); //A more simple aproach for creating a label...
panel1.add(newAdress);
panel1.add(pwSelection);
panel1.add(enc_btn);
panel1.add(dec_btn);
panel1.add(pwOutput);
//Add items of panel 1 to panel 2...
panel2.add(panel1);
add(panel2);
setSize(300,300);
setVisible(true);
//Proper way of stop the application at closing...
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
//This is not necessary as everything should be implemented in the constructor.
/*
public JFrame run(){
JFrame mainFrame= new JFrame ("Password");
mainFrame.setContentPane(new Password().panel1);
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainFrame.pack();
mainFrame.setLocationRelativeTo(null);
mainFrame.setSize(400, 200);
mainFrame.setResizable(false);
mainFrame.setVisible(true);
pwSelection.addItem("Name 1");
dec_btn.setText("Example");
setVisible(true);
return mainFrame;
}
* /
public static void main(String[] args){
//Initialize the constructor...
Password ps = new Password();
}
}
這將使您了解如何在Java上實現GUI。
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