身高和标准体重的转换（TextEventDeom.java）

最新推荐文章于 2022-11-19 20:33:07 发布

最新推荐文章于 2022-11-19 20:33:07 发布 · 203 阅读

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#java

本文提供了一个Java程序示例，展示了如何使用文本监听器（TextListener）来实现在两个文本框中输入数值时互相更新计算结果的功能。此程序采用AWT组件库创建窗口，并实现了简单的体重指数计算。

import java.awt.*; import java.awt.event.*; public class TextEventDemo extends Frame implements TextListener { private static final long serialVersionUID = 1L; Label lblC, lblF; TextField txtC, txtF; private class WindowCloser extends WindowAdapter { public void windowClosing(WindowEvent we) { System.exit(0); } } public TextEventDemo() { setLayout(new FlowLayout()); lblC = new Label ("Height:"); lblF = new Label ("Weight:"); txtC = new TextField(20); txtF = new TextField(20); add(lblC); add(txtC); add(lblF); add(txtF); txtC.addTextListener(this); txtF.addTextListener(this); addWindowListener(new WindowCloser()); setSize(250, 200); setLocation(200, 200); setVisible(true); } @Override public void textValueChanged(TextEvent arg0) { // TODO Auto-generated method stub TextField tmp = (TextField)arg0.getSource(); Double t = Double.valueOf(tmp.getText()); double T = t.doubleValue(); if(tmp == txtC) { T = T - 105; if(!txtF.getText().equals(Double.toString(T))) txtF.setText(Double.toString(T)); } else if(tmp == txtF) { T = T + 105; if(!txtC.getText().equals(Double.toString(T))); txtC.setText(Double.toString(T)); } } /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub TextEventDemo te = new TextEventDemo(); } }