CODEWITHSUNDEEP
javaswing
William Pfaffe
William Pfaffe

Reputation: 325

Saving String, then using it on another JFrame

Currently using Swing to create a GUI, for a login system. I retrieve a couple things from the database, one is a String named Username, and one is a int, named points. I have a class, where I have all my getters and setters in, which is called DBHandler. Upon retrieving these values, I use:

public String getUsername() {
    return username;
}

public void setUsername(String username) {
    this.username = username;
}

public int getPoints() {
    return points;
}

public void setPoints(int points) {
    this.points = points;
}

When I set these values (points is set inside the DBHandler.login method) using: 

public login(){
    DBHandler db = new DBHandler();
    db.setUsername(usernameTemp.getText());
    db.login();

}

However, when in another JFrame, that I call the instance of DBHandler, all values seem to be null. I use the getters to retrieve the values, but they are always empty.

public StudentScreen() {
    DBHandler db = new DBHandler();
    initComponents();
    showUser.setText(db.getUsername());
    showScore.setText("" + db.getPoints());
}

I know this is a fairly simple problem, but I just haven't been able to get past this. I've checked a couple posts, but nothing helped understanding this issue.

Best Regards

Upvotes: 0

Views: 68

Answers (1)

Thomas
Thomas

Reputation: 2560

Inside StudentScreen you are creating a new instance of DBHandler which has all its values set to their default values. You have to use the same instance everywhere. You either achieve this with a singleton pattern or by just passing the DBHandler as a parameter to the constructor of StudentScreen

Upvotes: 2

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