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

如何将在一个JFrame文本字段中输入的值作为输入参数传递给其他JFrame？

通过JTextFields在第一个JFrame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给出，每个帧在按钮点击时被重定向到其他帧

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，请参阅本教程 。 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 3

首先创建公共静态类型变量

public static JTextField txt2; public JTextField txt1，button1;

//第一个JFrame中的action button1

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

Answer 4

 Suppose u have two class like this: for login.java ---------------- suppose ur 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.