Question

如何将在一个JFrame文本字段中输入的值作为其他JFrame中的输入参数传递？

首先在JFrame到JTextFields ..

输入用户名和密码

String usr = jTextField2.getText();
String pass = jTextField3.getText();

相同的用户名和密码应在第四帧中作为输入提供每个框架都会在按钮单击时重定向到其他框架

Answer 1

假设您有许多帧，则必须为此目的创建实例变量。如果您不知道实例变量是什么，请参阅此tutorial。让我们看一个例子：

这将是您发送变量的框架：

public class MainFrame {
    public void actionPerformed(ActionEvent ev) {
    String user = userField.getText();
    String pass = passField.getText();
    FrameOne frameOne = new FrameOne();
    frameOne.setUser(user);
    frameOne.setPass(pass);

    /* 
     * You've passed the user and pass to other frame,
     * now you can make it visible.
     */
    frameOne.setVisible(true);
 }

这将是你的第一帧：

public class FrameOne extends JFrame {
    private JTextField userField;
    private JTextField passField;

    // then create setters and getter
    public void setUser(String user) {this.userField.setText(user);}
    public String getUser() {return this.userField.getText();}

    public void setPass(String pass) {this.passField.setText(pass);}
    public String getPass() {return this.passField.getText();}

    public FrameOne() {
        //define the components here
    }
}

注意：我没有编译代码，这仅用于演示您的问题。

Answer 2

您也可以像这样

将值传递给构造函数

你的主框架

public class MainFrame{
      //
      public void actionPerformed(ActionEvent ev){

       FrameOne frameOne = new FrameOne(userField.getText(), passField.getText());

       //you've passed the user and pass to other frame.
       // then you can make it visible.
       frameOne.setVisible(true);
     } 
}

你的下一个框架

public class FrameOne extends JFrame{
  private String user;
  private String pass;

  public FrameOne(String usr, String pas){
    this.user=usr;
    this.pass=pas;
    //define the components here
 }
}

Answer 3

首先创建公开的静态类型变量

public static JTextField txt2; public JTextField txt1，button1;

//第一个JFrame中的动作button1

JFrame2.setVisible（真）; JFrame2.txt2.setText（Me.txt1.getText（））;

Answer 4

Suppose u have two class like this:

for login.java
----------------
suppose u r calling welcome.java:
Welcome wc= new Welcome(new JFrame(), true);
after this line call a method of welcome.java which u have to create like:
wc.setUser(username);

for welcome.java
------------------

create a method:void setUser(String username) {
        user1 = user; 
        cname.setText(user1);
    }

user1 is global variable and available for all which u have to define lke:
String user1;
after it is assigning the username value to user1
here cname is a label which name is cname;
so, we are seeting the text of cname to the user.

将在一个JFrame文本字段中输入的值作为其他JFrame中的输入参数传递

4 个答案: