java传递在一个JFrame的文本字段中作为另一个JFrame的输入参数输入的值

Question

如何将在一个JFrame的文本字段中输入的值作为输入参数传递给另一个JFrame

在第一个JFrame到JTextFields中输入用户名和密码

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

应在第四帧中输入相同的用户名和密码 单击按钮时，每个帧都会重定向到其他帧

Answer 1

假设你有很多框架，你必须为此创建实例变量。 如果你不知道一个实例变量是什么，请看这个tutorial。 我们来看一个例子：

这将是发送变量的框架：

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，这只是为了演示您的问题

Answer 2

首先创建一个静态类型变量

公共静态JTextField txt2； 公共JTextField txt1，按钮1

//第一帧中的动作按钮1

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

Answer 3

您还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);
     } 
} 

你的下一帧

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 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.