如何从Java中的另一个类调用方法？

Question

我有一个Quick Quesiton，我需要帮助。我的问题是我创建了2个类，我想调用我的Panel类的方法“IsWin”。

这是方法，我有：

类名称：IsWin

public class IsWin { 

private JButton[][] slots; 
private Color playerColor = Color.red; 

public boolean Winner(int column, int row) { 

     boolean result = false; 

     // horizontal  
     boolean found = false; 
     int counter = 0; 

     for (int i = 0; i < slots.length; i++) {   
      if (slots[i][row].getBackground().equals(playerColor)) { 

      counter++; 

      // win 
      if (found == true) {    
       if (counter == 4) {    
       result = true; 
       break; 
       } 
      } 
      else {    
       found = true; 
      } 
      } 

      // reset counter 
      else {   
      if (found == true) {    
       counter = 0; 
      }   
      found = false; 
      } 
     } 

这就是我要调用的方法

这是我的面板类的类：connectFourPanel

private class clikMeButtonListener implements ActionListener{ 
public void actionPerformed(ActionEvent event) {  

    if (event.getSource() == clickMeOne 
     || event.getSource() == clickMeTwo 
     || event.getSource() == clickMeThree 
     || event.getSource() == clickMeFour 
     || event.getSource() == clickMeFive 
     || event.getSource() == clickMeSix 
     || event.getSource() == clickMeSeven 
    ) { 

    int lastEmptyIdx = -1; 

    for (int i = 0; i < slots[column].length; i++) {   
     if (slots[column][i].getBackground() != Color.white) { 

     break; 
     } 
     else {    
     lastEmptyIdx = i; 
     } 
    } 

    if (lastEmptyIdx != -1) {   
     slots[column][lastEmptyIdx].setBackground(playerColor); 

     if (IsWin.contains(column, lastEmptyIdx)) { 

     String message = playerColor == Color.red ? " Player One Won!" : " Player Two Won!"; 
     JOptionPane.showMessageDialog(null, message, " Results ", JOptionPane.INFORMATION_MESSAGE); 

     System.exit(0);    
     } 

     else {  
     playerColor = playerColor == Color.red ? Color.yellow : Color.red; 

     // assuming that Color.yellow is for computer player 
     if (isHumanVsComputer && playerColor == Color.yellow) {    
      doComputerMove(); 
     } 
     }  
    } 
    } 
} 

注意这不是我完整的代码

UDPATE：这是我在我的面板类..

IsWin myIsWin = new IsWin(); 
myIsWin.Winner(column, row); 

Answer 1

你可以让你想从另一个调用该方法类static，然后使用<ClassName>.<MethodName>调用它。

例如

public class Foo { 
    public static void foobar() { 
     /* Your Code Here */ 
    } 
} 

现在，可以按如下方式访问使用Foo.foobar();此方法：

public class Panel { 
    public void someMethod() { 
     Foo.foobar(); 
     /* Your Code Here */ 
    } 
} 

Answer 2

则需要声明类的目的IsWin的面板中类，并在那种情况下调用方法Winner()

示例：

IsWin myIsWin = new IsWin.... 

myIsWin.Winner(0, 0); 

Answer 3

您必须创建IsWin对象并访问Winner方法。 例如：

IsWin iw = new IsWin(); 
    if (iw.winner(column, lastEmptyIdx)) { 
     String message = playerColor == Color.red ? " Player One Won!" : " Player Two Won!"; 
     JOptionPane.showMessageDialog(null, message, " Results ", JOptionPane.INFORMATION_MESSAGE); 

     System.exit(0);    
    }