import java.awt.*;//计算器实例import java.awt.event.*;public class calculator{public static void main(String args[]){MyWindow my=new MyWindow("计算器"); }}class MyWindow extends Frame implements ActionListener{
StringBuffer m=new StringBuffer();
int p; TextField tex; Button b0,b1,b2,b3,b4,b5,b6,b7,b8,b9,jia,jian,cheng,chu,deng,dian,qingling,kaifang;MyWindow(String s){ super(s);//StringBuffer s2=new StringBuffer();//String s;tex=newTextField(18); b0=new Button("
0 "); b1=new Button("
1 "); b2=new Button("
2 "); b3=new Button(" 3
"); b4=new Button("
4 "); b5=new Button("
5 "); b6=new Button("
6 "); b7=new Button("
7 "); b8=new Button("
8 "); b9=new Button("
9 ");
dian=new Button("
. ");
jia=new Button("
+ ");
jian=new Button("
-
"); cheng=new Button("
× ");
chu=new Button("
/
");
deng=new Button("
= "); qingling=new Button("清零 ");
kaifang=new Button(" √ ");setLayout(new FlowLayout()); add(tex); add(b0); add(b1); add(b2); add(b3); add(b4); add(b5); add(b6); add(b7); add(b8); add(b9); add(dian); add(jia); add(jian);add(cheng);add(chu); add(kaifang); add(qingling); add(deng); b0.addActionListener(this); b1.addActionListener(this); b2.addActionListener(this); b3.addActionListener(this); b4.addActionListener(this); b5.addActionListener(this); b6.addActionListener(this); b7.addActionListener(this); b8.addActionListener(this); b9.addActionListener(this); jia.addActionListener(this); jian.addActionListener(this); cheng.addActionListener(this); chu.addActionListener(this); dian.addActionListener(this); deng.addActionListener(this); qingling.addActionListener(this); kaifang.addActionListener(this);setBounds(200,200,160,280); setResizable(false);//不可改变大小 setVisible(true); validate();addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent ee) { System.exit(0);
}
});}public void actionPerformed(ActionEvent e){ if(e.getSource()==b0) {
m=m.append("0");
tex.setText(String.valueOf(m));}if(e.getSource()==b1) {
m=m.append("1"); tex.setText(String.valueOf(m));} if(e.getSource()==b2) {
m=m.append("2"); tex.setText(String.valueOf(m));} if(e.getSource()==b3) {
m=m.append("3"); tex.setText(String.valueOf(m));} if(e.getSource()==b4) {
m=m.append("4"); tex.setText(String.valueOf(m));} if(e.getSource()==b5) {
m=m.append("5"); tex.setText(String.valueOf(m));} if(e.getSource()==b6) {
m=m.append("6"); tex.setText(String.valueOf(m));} if(e.getSource()==b7) {
m=m.append("7"); tex.setText(String.valueOf(m));} if(e.getSource()==b8) {
m=m.append("8"); tex.setText(String.valueOf(m));}if(e.getSource()==b9) {
m=m.append("9"); tex.setText(String.valueOf(m));} if(e.getSource()==jia) {
m=m.append("+"); tex.setText(String.valueOf(m));}
if(e.getSource()==jian) {
m=m.append("-"); tex.setText(String.valueOf(m));} if(e.getSource()==cheng) {
m=m.append("*"); tex.setText(String.valueOf(m));} if(e.getSource()==chu) {
m=m.append("/"); tex.setText(String.valueOf(m));}if(e.getSource()==dian) {
m=m.append("."); tex.setText(String.valueOf(m));} String mm=String.valueOf(m); int p1=mm.indexOf("+"); int p2=mm.indexOf("-"); int p3=mm.indexOf("*"); int p4=mm.indexOf("/"); if(p1!=-1) {p=p1; }else if(p3!=-1) {p=p3; } else if(p2!=-1) {p=p2; } else if(p4!=-1) {p=p4; }if(e.getSource()==deng) { String m1=mm.substring(0,p); String m2=mm.substring(p+1); String ch=mm.substring(p,p+1);
//System.out.println(m1); //System.out.println(m2); //System.out.println(ch);
if(ch.equals("+")) { float n1=Float.parseFloat(m1);
float n2=Float.parseFloat(m2);
float sum=n1+n2; String su=String.valueOf(sum); tex.setText(su); }if(ch.equals("-")) { float n1=Float.parseFloat(m1);
float n2=Float.parseFloat(m2);
float sum=n1-n2; String su=String.valueOf(sum); tex.setText(su); }if(ch.equals("*")) { float n1=Float.parseFloat(m1);
float n2=Float.parseFloat(m2);
float sum=n1*n2; String su=String.valueOf(sum); tex.setText(su); }if(ch.equals("/")) { float n1=Float.parseFloat(m1);
float n2=Float.parseFloat(m2);
float sum=n1/n2; String su=String.valueOf(sum); tex.setText(su); }}if(e.getSource()==qingling) {StringBuffer kk=new StringBuffer(); m=kk;
tex.setText("0"); // System.out.println(mm); }if(e.getSource()==kaifang) {String t=tex.getText();float num=Float.parseFloat(t);double nub=Math.sqrt(num);tex.setText(String.valueOf(nub)); } }}
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