shorttextfield.java

Java程序设计技巧与开发实例附书源代码。

import java.awt.*;

public class ShortTextField
        extends TextField {
    private final static int MAX = 10;

    public String getShortText() throws LongStringException {
        if (getText().length() <= MAX) {
            return getText();
        }
        else {
            throw new LongStringException("String too long. Max: " + MAX);
        }
    }
}