Question

java文本框输入问题

窗口中有一个文本框接受用户输入
当用户输入英文字母（大、小写均可）时，在标签上显示该字母在字母表中的顺序
当用户输入非英文字母时，在标签上显示“您输入的不是英文字母”

各位大哥小弟是初学者，希望能把完整的代码写下，不胜感激

Answer 1

import java.awt.GridLayout;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.event.CaretEvent;
import javax.swing.event.CaretListener;

public class Show extends JFrame implements KeyListener, CaretListener{
/**
*
*/
private static final long serialVersionUID = 5001501249410255739L;
private JTextField input;
private JTextField output;
private char ch;
private boolean pressed = false;

public Show() {
this.setLayout(new GridLayout(2, 1));
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setSize(320, 240);
input = new JTextField();
input.addCaretListener(this);
input.addKeyListener(this);
output = new JTextField();
output.setEditable(false);
this.add(input);
this.add(output);
this.setVisible(true);
}

private boolean isAlphater(char ch) {
if(ch >= 'a' && ch <= 'z' || ch >= 'A' && ch <= 'Z')
return true;
else
return false;
}

public void keyPressed(KeyEvent arg0) {
// TODO Auto-generated method stub
ch = arg0.getKeyChar();
pressed = true;
}

public void keyReleased(KeyEvent arg0) {
// TODO Auto-generated method stub

}

public void keyTyped(KeyEvent arg0) {
// TODO Auto-generated method stub

}

public void caretUpdate(CaretEvent e) {
// TODO Auto-generated method stub
if(pressed)
{
if(isAlphater(ch))
output.setText(" " + String.valueOf(ch));
else
output.setText(" 您输入的不是英文字母");
pressed = false;
}
}

public static void main(String[] args) {
new Show();
}
}

Answer 2

<input type=text id="txt" onkeyup="checkWord(this)"><div id="msg"></div>

<script>
function checkWord(obj){
var val=obj.value.toLowerCase();
var msgdiv=document.getElementById("msg");
if(val=='a'){
msgdiv.innerHTML="该字母在字母表中的顺序为:1";
}else if(val=='b'){
msgdiv.innerHTML="该字母在字母表中的顺序为:2";
}else if(val=='c'){
msgdiv.innerHTML="该字母在字母表中的顺序为:3";
}else if(val=='d'){
msgdiv.innerHTML="该字母在字母表中的顺序为:4";
}else if(val=='e'){
msgdiv.innerHTML="该字母在字母表中的顺序为:5";
}else if(val=='f'){
..........
}
....
....
....
else{
msgdiv.innerHTML="您输入的不是英文字母";
}
}
</script>