当我在键盘上输入一个键时,我一直遇到问题,它一直返回键盘代码,例如当我按 1 时,它返回的值为49
我已经尝试更改数据类型以使用char
并且问题仍然存在。它似乎只在我的一种方法中输出键盘代码,但不适用于我拥有的addKeyListener
方法。当我打印出SETSIZE
变量时,它会返回正确的输入,但是在我的方法中称为assignMove
num
参数不断输出键盘代码,我不确定为什么。将不胜感激。
面板单元类
private GamePanel panel;
private int row;
private int col;
public static final char SETSIZE = 5;
addKeyListener(new KeyAdapter() {
@Override
public void keyTyped(KeyEvent e) {
char SETSIZE = e.getKeyChar();
panel.assignMove(row, col, SETSIZE);
}
});
游戏面板类
void assignMove(int row, int col, int num)
{
System.out.print(num);
if ((row<1) || (row>Futoshiki.SETSIZE)) {
JOptionPane.showMessageDialog(null,
"invalid row (" + row + ")",
"Futoshiki",
JOptionPane.DEFAULT_OPTION);
throw new FutoshikiException("invalid row (" + row + ")");
}
if ((col<1) || (col>Futoshiki.SETSIZE)) {
JOptionPane.showMessageDialog(null,
"invalid column (" + col + ")",
"Futoshiki",
JOptionPane.DEFAULT_OPTION);
throw new FutoshikiException("invalid column (" + col + ")");
}
if (game.isAssigned(row, col)) {
JOptionPane.showMessageDialog(null,
"the cell at (" + row + "," + col + ") is assigned (" + game.getNum(row,col) + ")",
"Futoshiki",
JOptionPane.DEFAULT_OPTION);
throw new FutoshikiException("the cell at (" + row + "," + col + ") is assigned (" + game.getNum(row,col) + ")");
}
if ((num<1) || (num>Futoshiki.SETSIZE)) {
JOptionPane.showMessageDialog(null,
"invalid value " + num,
"Futoshiki",
JOptionPane.DEFAULT_OPTION);
throw new FutoshikiException("invalid value " + num);
}
if (!game.isValidAssign(row, col, num)) {
JOptionPane.showMessageDialog(null,
"invalid value assignment " + row + " " + col + " " + num,
"Futoshiki",
JOptionPane.DEFAULT_OPTION);
throw new FutoshikiException("invalid value assignment " + row + " " + col + " " + num);
}
Assign userMove = new Assign(row, col, num);
System.out.print("row " + row + " " + "col "+ col + " " + "num " + num);
game.assign(userMove);
}
char
是Java中的原始类型。它是一个 16 位无符号整数,表示 Unicode 代码点。它不包含键盘上显示的值。
您可以使用类java.lang.Character
的方法获取"键盘"值。
addKeyListener(new KeyAdapter() {
@Override
public void keyTyped(KeyEvent e) {
char ch = e.getKeyChar();
if (Character.isDigit(ch)) {
panel.assignMove(row, col, Character.getNumericValue(ch));
}
}
});
或者,您可以简单地检查该值。
addKeyListener(new KeyAdapter() {
@Override
public void keyTyped(KeyEvent e) {
char ch = e.getKeyChar();
int val = (int) ch;
if (val >= 48 && val <= 57) {
panel.assignMove(row, col, val - 48);
}
}
});
在assignMove
方法中使用char num
而不是int num
。因为您的num
参数是一个int
,所以传递的char
值将类型转换为int
这将是 ASCII 代码。
样本:
void assignMove(int row, int col, char num)