點擊計數按鈕

我想統計使用GUI點擊按鈕的次數。點擊計數按鈕

我這樣做代碼：

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) 
{           
    int clicked = 0; 
    clicked++; 
    System.out.println(clicked); 
}

但它顯示輸出「1」，每次我點擊按鈕。

我希望每次點擊按鈕向我顯示計數。例如：如果我點擊按鈕兩次，它應該給我輸出「2」。

來源

2013-02-21 sofian

由於您已在動作方法內定義了變量，因此每次單擊時都會重置計數器。儘量不要這樣做。

int clicked = 0; // move this outside 
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) 
{           
    // int clicked = 0; -- this resets it to 0 each time 
    clicked++; 
    System.out.println(clicked); 
}

來源

2013-02-21 10:05:01 Maccath

變化

int clicked = 0;

是你的類的成員。這樣，每次按下按鈕時都不會設置爲零。

來源

2013-02-21 10:05:26 BobTheBuilder

您已經聲明clicked作爲一個局部變量，初始化爲0，它永遠是任何東西，但1

讓clicked類級別的變量，而不是...

private int clicked = 0; 

//... 

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) 
{           
    clicked++; 
    System.out.println(clicked); 
}

來源

2013-02-21 10:06:03 MadProgrammer

試試下面的代碼

int clicked = 0; 
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) 
{           

    clicked++; 
    System.out.println(clicked); 
}

來源

2013-02-21 10:06:07

您已在中聲明count變量。在塊外聲明它。

int clicked = 0; //make it as your class member. 
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) 
{           

    clicked++; 
    System.out.println(clicked); 
}

來源

2013-02-21 10:06:23 kaysush

取決於你如何實例化這個類，你需要在任現場級或類變量級別聲明clicked變量。目前，clicked變量的範圍是該方法的本地範圍。

選項1

int clicked = 0; 

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) 
{           
    clicked++; 
    System.out.println(clicked); 
}

選項2

static int clicked = 0; 

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) 
{           
    clicked++; 
    System.out.println(clicked); 
}

使用將取決於實例的選項。如果可能的話，應該避免第二種選擇。

每次 jButton1ActionPerformed火災

來源

2013-02-21 10:06:33

，被點擊的變量被實例化回0，這就是爲什麼它總是給你的值爲1。你應該將這種方法

//Somewhere in your class 
private intClicked = 0; 
//More methods here. 

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) 
{           
    clicked++; 
    System.out.println(clicked); 
}

來源

2013-02-21 10:38:58 KyelJmD

import java.awt.BorderLayout; 
import java.awt.EventQueue; 

import javax.swing.JFrame; 
import javax.swing.JPanel; 
import javax.swing.border.EmptyBorder; 
import javax.swing.JTextField; 
import javax.swing.JButton; 
import java.awt.event.ActionListener; 
import java.awt.event.ActionEvent; 


public class Threading extends JFrame { 

    private JPanel contentPane; 
    private JTextField DisplayOne; 
    private JTextField DisplayTwo; 

    int count; 
    int count1; 
    int count2; 


    /** 
    * Launch the application. 
    */ 

    public static void main(String[] args) { 
     EventQueue.invokeLater(new Runnable() { 
      public void run() 
      { 
        try { 
        Threading frame = new Threading(); 
        frame.setVisible(true); 
       } catch (Exception e) { 
        e.printStackTrace(); 
       } 
      } 
     }); 
    } 

    /** 
    * Create the frame. 
    */ 


    public Threading() 
    { 
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     setBounds(100, 100, 450, 300); 
     contentPane = new JPanel(); 
     contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); 
     contentPane.setLayout(new BorderLayout(0, 0)); 
     setContentPane(contentPane); 

     JPanel panel = new JPanel(); 
     contentPane.add(panel, BorderLayout.CENTER); 

     DisplayOne = new JTextField(); 
     panel.add(DisplayOne); 
     DisplayOne.setColumns(10); 

     DisplayTwo = new JTextField(); 
     panel.add(DisplayTwo); 
     DisplayTwo.setColumns(10); 

     JButton btnCountOne = new JButton("Count 1"); 
     count1=0; 
     btnCountOne.addActionListener(new ActionListener() {     
       public void actionPerformed(ActionEvent arg0) 
       { 
        DisplayOne.setText(Integer.toString(count1++)); 
       } 
     }); 
     panel.add(btnCountOne); 

     JButton btnCountTwo = new JButton("Count 2"); 
     count2=0; 
     btnCountTwo.addActionListener(new ActionListener() { 
      public void actionPerformed(ActionEvent arg0) 
      { 
       DisplayTwo.setText(Integer.toString(count2++)); 
      } 
     }); 
     panel.add(btnCountTwo); 

     JButton btnCountBoth = new JButton("Count Both"); 
     count=0; 
     btnCountBoth.addActionListener(new ActionListener() { 
      public void actionPerformed(ActionEvent arg0) 
      { 
       while (count < 10) 
       { 
       DisplayOne.setText(Integer.toString(++count)); 
       DisplayTwo.setText(Integer.toString(count)); 
       } 
      } 
     }); 
     panel.add(btnCountBoth); 
    } 

}

的 clicked變量外

來源

2013-03-16 07:33:41 user2176458

點擊計數按鈕

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