java中从哈希表中获取方法
在下面的代码中,我创建了一个哈希表,它存储int number和带有“put”方法的JButtons 但是,当我试图用整数从哈希表中“获取”时,我得到了一个编译器错误——“类型不匹配:无法从整数转换为JButton” 为什么呢?我要拿一个钮扣回来不 代码如下:java中从哈希表中获取方法,java,hash,jbutton,Java,Hash,Jbutton,在下面的代码中,我创建了一个哈希表,它存储int number和带有“put”方法的JButtons 但是,当我试图用整数从哈希表中“获取”时,我得到了一个编译器错误——“类型不匹配:无法从整数转换为JButton” 为什么呢?我要拿一个钮扣回来不 代码如下: package Q2; import javax.swing.*; import java.util.Hashtable; import java.awt.BorderLayout; import java.awt.Color; impo
package Q2;
import javax.swing.*;
import java.util.Hashtable;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.TextField;
import java.awt.event.*;
import java.util.EventListener;
import java.util.Hashtable;
public class MainPanel extends JPanel{
**private Hashtable<JButton, Integer> keyboardHash;**
private JButton[][] button;
private JPanel[] panel; //Array of panels for each buttons line
private JPanel parent;
private static final String[][] key = {
{"`","1","2","3","4","5","6","7","8","9","0","-","+","Backspace"},
{"Tab","Q","W","E","R","T","Y","U","I","O","P","[","]"},
{"Caps","A","S","D","F","G","H","J","K","L",";","'","\\","Enter"},
{"Shif","Z","X","C","V","B","N","M",",",".","?","/"},
{" ",",","<","v",">"}};
private static final int[][] keyNumber = {
{192,49,50,51,52,53,54,55,56,57,48,45,61,8},
{9,81,87,69,82,84,89,85,73,79,80,91,93},
{20,65,83,68,70,71,72,74,75,76,59,192,222,10},
{16,90,88,67,86,66,66,78,77,44,46,47},
{32,37,40,39,86}};
//Constructor for main Panel
public MainPanel(){
super();
setLayout(new BorderLayout());
**keyboardHash = new Hashtable<JButton,Integer>();**
TextField textField = new TextField(20);
MyKeyListener myKeyListener = new MyKeyListener();
textField.addKeyListener(myKeyListener);
Font font1 = new Font("david", Font.BOLD, 22);
textField.setFont(font1);
add(textField,BorderLayout.CENTER);
//initialize the parent panel and array of 5 panels and the buttons array
parent = new JPanel();
parent.setLayout(new GridLayout(0,1));
panel = new JPanel[5];
button = new JButton[20][20];
for (int row = 0; row<key.length; row++){
panel[row] = new JPanel();
for (int column = 0; column<key[row].length; column++){
button[row][column] = new JButton(key[row][column]);
button[row][column].setFont(new Font("Ariel",Font.PLAIN, 22));
button[row][column].setMargin(new Insets(10, 20, 10, 20));
**keyboardHash.put(button[row][column], keyNumber[row][column]);**
/*
button[row][column].putClientProperty("row", row);
button[row][column].putClientProperty("column", column);
button[row][column].putClientProperty("key", key[row][column]);
*/
panel[row].add(button[row][column]);
}
parent.add(panel[row]);
}
add(parent,BorderLayout.SOUTH);
}
public class MyKeyListener implements KeyListener{
@Override
public void keyPressed(KeyEvent e) {
int numKey = e.getKeyCode();
**JButton btnToColor = keyboardHash.get(numKey);**
System.out.println(numKey);
button[2][2].setBackground(Color.yellow);
}
@Override
public void keyReleased(KeyEvent e) {
button[2][2].setBackground(null);
}
@Override
public void keyTyped(KeyEvent e) {
}
}
}
Q2包;
导入javax.swing.*;
导入java.util.Hashtable;
导入java.awt.BorderLayout;
导入java.awt.Color;
导入java.awt.Font;
导入java.awt.GridLayout;
导入java.awt.Insets;
导入java.awt.TextField;
导入java.awt.event.*;
导入java.util.EventListener;
导入java.util.Hashtable;
公共类主面板扩展了JPanel{
**私有哈希表键盘哈希**
专用JButton[]]按钮;
私有JPanel[]面板;//每个按钮行的面板数组
私人JPanel家长;
私有静态最终字符串[][]密钥={
{“`”,“1”,“2”,“3”,“4”,“5”,“6”,“7”,“8”,“9”,“0”,“-”,“+”,“Backspace”},
{“Tab”,“Q”,“W”,“E”,“R”,“T”,“Y”,“U”,“I”,“O”,“P”,“[”,“].”,
{“Caps”、“A”、“S”、“D”、“F”、“G”、“H”、“J”、“K”、“L”、“;”、“'”、“\\”、“Enter”},
{“Shif”,“Z”,“X”,“C”,“V”,“B”,“N”,“M”,“N”,“M”,“N”,“N”,“N”,“N”,“N”,“N”,“N”,“N”,“N”,“N”,“N”,“N”,“N”,“N”,“N”,“N”,“N”,“N”,“N”,“N”,“N”,“N”,“N”,“N”,“N”,“N”,“N”,“N”,“N”,“N”,“N”,“N”,“N,
{" ",",",""}};
专用静态最终int[][]键号={
{192,49,50,51,52,53,54,55,56,57,48,45,61,8},
{9,81,87,69,82,84,89,85,73,79,80,91,93},
{20,65,83,68,70,71,72,74,75,76,59,192,222,10},
{16,90,88,67,86,66,66,78,77,44,46,47},
{32,37,40,39,86}};
//主面板的构造
公共主面板(){
超级();
setLayout(新的BorderLayout());
**keyboardHash=新哈希表()**
TextField TextField=新的TextField(20);
MyKeyListener MyKeyListener=新建MyKeyListener();
addKeyListener(myKeyListener);
Font font1=新字体(“david”,Font.BOLD,22);
textField.setFont(font1);
添加(textField,BorderLayout.CENTER);
//初始化父面板和5个面板的阵列以及按钮阵列
父项=新的JPanel();
setLayout(新的GridLayout(0,1));
面板=新JPanel[5];
按钮=新的JButton[20][20];
对于(int row=0;row,您的泛型类在哈希表声明中的位置是错误的。请交换JButton和Integer
private Hashtable<Integer, JButton> keyboardHash;
私有哈希表键盘哈希;
Hashtable
表示您的键是JButton
s,值是Integer
s。使用get时,您提供键并返回值