Pass values entered in one JFrame's text field as an input parameter in other JFrame

问题

How to pass values entered in one JFrame's text field as an input parameter in other JFrame?

Entered user name and password in first JFrame through JTextFields..

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

Same username and password should be given as input in forth frame each frame is redirected to other on button click

回答1:

Suppose you have many frames, you have to create instance variables for that purpose. If you don't know what an instance variable see this tutorial. Lets see an example:

This will be your frame that sends the variables :

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);
 }

And this will be your first frame:

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
    }
}

NOTE : I didn't compile the code, this is only for demonstration on your problem.

回答2:

You can also pass values to the constructor like this

Your main frame

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);
     } 
}

Your next frame

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
 }
}

回答3:

first create publicly static type variable

public static JTextField txt2; public JTextField txt1,button1;

//action button1 in 1st JFrame

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

回答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.

来源：https://stackoverflow.com/questions/17412498/pass-values-entered-in-one-jframes-text-field-as-an-input-parameter-in-other-jf

标签

java

swing

jframe

jtextfield