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題目：簡易計(jì)算器的設(shè)計(jì) 一、設(shè)計(jì)概要 1、設(shè)計(jì)內(nèi)容 計(jì)算器的設(shè)計(jì)使用圖形用戶界面實(shí)現(xiàn)，能夠進(jìn)行簡單的加、減、乘、除四則計(jì)算；參與運(yùn)算的數(shù)字通過點(diǎn)擊按鈕輸入。 2、程序流程圖 開始 創(chuàng)建界面框架 創(chuàng)建文本框方法 創(chuàng)建面板方法 創(chuàng)建按鈕方法 添加按鈕到面板 創(chuàng)建數(shù)字按鈕對(duì)象 創(chuàng)建運(yùn)算符號(hào)按鈕對(duì)象 運(yùn)算與判斷? N Y 結(jié)束 2、 詳細(xì)設(shè)計(jì) import java.awt.BorderLayout; //導(dǎo)入AWT頁面設(shè)置類 import java.awt.Button; //導(dǎo)入AWT按鈕類 import java.awt.Frame; import java.awt.GridLayout; import java.awt.Panel; import java.awt.TextField; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; //導(dǎo)入AWT鼠標(biāo)監(jiān)視器 import java.awt.event.WindowEvent; import java.awt.event.WindowListener;//導(dǎo)入AWT窗口監(jiān)視器 //創(chuàng)建計(jì)算器的主窗口，該類含有main函數(shù) public class Calculator { public static void main(String[] args) { //創(chuàng)建Frame對(duì)象 Frame f = new Frame("Calculator"); //創(chuàng)建文本框，用于接收數(shù)字和操作 final TextField tf = new TextField(); //聲明一個(gè)面板用于存放按鈕 Panel p = new Panel(); f.setLayout(new BorderLayout()); //將文本框放在北部 f.add(tf, BorderLayout.NORTH); //將按鈕放于中部 f.add(p, BorderLayout.CENTER); //設(shè)置布局模式 p.setLayout(new GridLayout(4, 4)); //創(chuàng)建16個(gè)按鈕 Button one = new Button("1"); Button two = new Button("2"); Button three = new Button("3"); Button four = new Button("4"); Button five = new Button("5"); Button six = new Button("6"); Button seven = new Button("7"); Button eight = new Button("8"); Button nine = new Button("9"); Button zero = new Button("0"); Button add = new Button("+"); Button sub = new Button("-"); Button mul = new Button("*"); Button div = new Button("/"); Button decimal = new Button("."); final Button equal = new Button("="); //將按鈕添加到P p.add(one); p.add(two); p.add(three); p.add(four); p.add(five); p.add(six); p.add(seven); p.add(eight); p.add(nine); p.add(zero); p.add(add); p.add(sub); p.add(mul); p.add(div); p.add(decimal); p.add(equal); final String[] ary = {"", null, ""}; //該類為主類創(chuàng)建數(shù)字按鈕對(duì)象 class NumMouseListener implements MouseListener{ public void mouseClicked(MouseEvent e) { String num = ((Button)e.getSource()).getLabel().trim(); if(ary[1] == null) { ary[0] = ary[0] + "" + num; } else{ ary[2] = ary[2] + "" + num; } tf.setText(tf.getText() + "" + num); } public void mouseEntered(MouseEvent e) {} public void mouseExited(MouseEvent e) {} public void mousePressed(MouseEvent e) {} public void mouseReleased(MouseEvent e) {} } //為每個(gè)按鈕添加事件 one.addMouseListener(new NumMouseListener()); two.addMouseListener(new NumMouseListener()); three.addMouseListener(new NumMouseListener()); four.addMouseListener(new NumMouseListener()); five.addMouseListener(new NumMouseListener()); six.addMouseListener(new NumMouseListener()); seven.addMouseListener(new NumMouseListener()); eight.addMouseListener(new NumMouseListener()); nine.addMouseListener(new NumMouseListener()); zero.addMouseListener(new NumMouseListener()); //該類為主類創(chuàng)建運(yùn)算符號(hào)按鈕對(duì)象 class Operatotr MouseListener implements MouseListener{ public void mouseClicked(MouseEvent e) { if(e.getSource() == equal) {try { long result = calculate(Integer.parseInt(ary[0]), Integer.parseInt (ary[2]), ary[1]); tf.setText(String.valueOf(result)); ary[0] = tf.getText(); ary[1] = null; ary[2] = ""; } catch (Exception e1) { e1.printStackTrace(); } } else{ ary[1] = ((Button) e.getSource()).getLabel(); if(ary[0].length() > 0) { ary[2] = ""; } else{ary[0] = String.valueOf(tf.getText()); } tf.setText(""); } } private long calculate(int i, int j, String operator) throws Exception { if(operator.equals("+")) {return i + j; } else if(operator.equals("-")) {return i - j; } else if(operator.equals("*")) {return i * j;} else if(operator.equals("/")) {return i / j;}else {throw new Exception("Invalid operator.(Only +-/* accepted");} } public void mouseEntered(MouseEvent e) {} public void mouseExited(MouseEvent e) {} public void mousePressed(MouseEvent e) {} public void mouseReleased(MouseEvent e) {} } add.addMouseListener(new OperatotrMouseListener()); mul.addMouseListener(new OperatotrMouseListener()); div.addMouseListener(new OperatotrMouseListener()); sub.addMouseListener(new OperatotrMouseListener()); equal.addMouseListener(new OperatotrMouseListener()); f.addWindowListener(new WindowListener(){ public void windowClosing(WindowEvent e) { System.exit(0); } public void windowActivated(WindowEvent e) {} public void windowClosed(WindowEvent e) {} public void windowDeactivated(WindowEvent e) {} public void windowDeiconified(WindowEvent e) {} public void windowIconified(WindowEvent e) {} public void windowOpened(WindowEvent e) {} }); f.setVisible(true); //使界面可現(xiàn) f.setBounds(200, 200, 250, 250); //設(shè)置界面的位置 三、運(yùn)行調(diào)試與分析討論 1、乘法計(jì)算，運(yùn)算結(jié)果如圖 2、除法計(jì)算，運(yùn)算結(jié)果如圖 結(jié)果分析： 由計(jì)算結(jié)果可以看出，計(jì)算器可以完成簡單的加、減、乘、除運(yùn)算，但計(jì)算器不具有清零的效果。 四、總結(jié)與體會(huì)（設(shè)計(jì)遇到的問題及解決辦法,通過設(shè)計(jì)學(xué)到了哪些新知識(shí), 鞏固了哪些知識(shí)，有哪些提高。） 計(jì)算器設(shè)計(jì)中遇到了AWT方法的使用、鼠標(biāo)響應(yīng)事件的處理等問題，面對(duì)這些問題，我通過和同學(xué)商量，以及到圖書館借與java語言相關(guān)的書籍，最終解決了問題。 通過計(jì)算器的設(shè)計(jì)我學(xué)會(huì)了AWT方法的使用、鼠標(biāo)響應(yīng)事件等新知識(shí)，鞏固了多線程、類的繼承、接口等知識(shí)點(diǎn)。這次設(shè)計(jì)既鍛煉了解決問題的能力，又深刻的認(rèn)識(shí)和理解了java的基礎(chǔ)知識(shí)。