使用击键增加窗口大小

Question

I went with what I could find in java for dummies and what I'm doing isn't working? I'd like a fix and some advice on whether I should focus on simpler things.

this is the code...

package frame;
import java.util.Scanner;
import javax.swing.JFrame ;

public class Frame_create {`enter code here`
public static void main(String args[]) {
JFrame myFrame = new JFrame() ;
String myTitle = "blank frame" ;
myFrame.setTitle(myTitle) ;
myFrame.setSize(width, height) ;
myFrame.setDefaultCloseOperation
(JFrame.EXIT_ON_CLOSE) ;
myFrame.setVisible(true) ;
}

static int width = 600 ; 
static int height = 200 ;
private Scanner readyread; 



public void input(String args[]){
    readyread = new
    Scanner(System.in);
    int inputNumber = readyread.nextInt();
    int increase = inputNumber*100 ;
    width += increase ;
}}

Answer 1

Are you calling the input(String args[]) method anywhere? Below is a modification which creates a Frame_create object and then calls the the input method on it. The input method is also changed to take in the JFrame object as a second parameter so that the setSize method can be called on it again to set the increased width. The number that will denote the increase in size needs to be typed in the console.

package frame;
import java.util.Scanner;
import javax.swing.JFrame ;

public class Frame_create {
public static void main(String args[]) {
  Frame_create fc = new Frame_create();
  JFrame myFrame = new JFrame() ;
  String myTitle = "blank frame" ;
  myFrame.setTitle(myTitle) ;
  myFrame.setSize(width, height) ;
  myFrame.setDefaultCloseOperation
      (JFrame.EXIT_ON_CLOSE) ;
  myFrame.setVisible(true) ;
  fc.input(args, myFrame);
}

static int width = 600 ; 
static int height = 200 ;
private Scanner readyread; 

public void input(String args[], JFrame myFrame){
    readyread = new
    Scanner(System.in);
    int inputNumber = readyread.nextInt();
    int increase = inputNumber*100 ;
    width += increase ;
    myFrame.setSize(width, height);
  }
}

This seems to be working. Hope this helps. Note that if you want to continuously type in a changed size and see the width increase then you will have to put the call to input method in a loop.

While this might answer the question, using console and GUI together in this fashion may not be optimal in a real world application.