利用java做一个简单的计算器[转载]

两个类。还只是完成＋、－、×、÷运算而已。 | <d:U I{  
GUI只是用了AWT，很简单，相信一看就能懂了。 v2astjy]  
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Calculator.java MPm%]%|c]  
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public class Calculator{ ="05Q<V '  
private String result = "0"; #c~RA?QY  
private int op = 0,add = 1,sub = 2,mul = 3,div = 4; >G4aQp>l  
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private double stringToDouble(String x){ u{uY?q_g|s  
double y = Double.parseDouble(x); O)?4z**  
return y; dt}R\-  
} ~;|w-P R  
private void operate(String x){  *>H~rY%  
double x1 = stringToDouble(x); ;gN VO  
double y = stringToDouble(result); {o^VA8 O  
switch (op){ J`!nlq3  
case 0: F oa8w?v  
result = x; T1[5=%p+Zu  
break; 2 Npg;Ho  
case 1: 2yhj> VFy  
result = String.valueOf(y+x1); lgeL,@-k  
break; 2#RUc@k14v  
case 2:  [+9N <  
result = String.valueOf(y-x1); UH6 }2]  
break; 30z=/g  
case 3: 2/OE;/c  
result = String.valueOf(y*x1); ZTQ =n7e  
break; \P  
case 4: llVPB.|gm  
if(x1!=0){ .w`7<P!  
result = String.valueOf(y/x1); ol^;wC  
}else{ OV78,pkN  
result = "The divisor can't be zero!"; yY71%N5
  
} q5X (16  
break; `)z*\#  
} $(t{-0}5  
} Q1K;G?j7r  
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public String opAdd(String x){ c {&kT O{  
operate(x); teU@   
op = add; px+8,8Q!  
return result; )-IK!FlBEx  
} L,X]  
public String opSubtract(String x){ *<#
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operate(x); (Q,lH<B  
op = sub; sw>KBFC  
return result; 98 K Rr>  
} K
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public String opMultiply(String x){ #I;s!][o{  
operate(x); uPd.TUww  
op = mul; Q R O4J8  
return result; ~f D,z[]5:  
} ?_}PJ:e&$~  
public String opDivide(String x){ SPs"~)T  
operate(x); VR*8D;1#  
op = div; 9bt[wwW%Uu  
return result; |~H)#+in]  
} y1Ila3JV  
public String opEquals(String x){ +;xJ(2K-k  
operate(x); (FYdSq#>  
op = 0; p-MA`!
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return result; &.H PNNP*]  
} OkBCi>H=  
public void opClean(){ iSf+TBmTs  
op = 0; ;`^yCXOy8  
result = "0"; ]:TL6:{l![  
} 8<  G//O  
} =E]wLl  

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------------------------------------------------------------------- n!8_{(f  
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第二个 c&PNwfzfF  
CalculatorGUI.java _Vf#)v]Fo  
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import java.awt.*; *S hJnf.  
import java.awt.event.*; E)9 }>lEh  
import java.util.EventObject; mCK0*rKB  
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public class CalculatorGUI{ r(3R09L;^8  
private Frame f; rxx}NFztE  
private Panel p1,p2; I=
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private Button b0,b1,b2,b3,b4,b5,b6,b7,b8,b9; Xk0n[  
private Button bPoint,bAdd,bDec,bMul,bDiv,bCal; -7`8 %k  
private TextField tf; h# y qG  
private String s,op; Wq|c l /
 
private Calculator cal = new Calculator(); ]D(Ho$\S
 
private boolean ifOp; +gN,wo  
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public CalculatorGUI(){ *:x'i-  
f = new Frame("Calculator"); 7VaL}o<j  
p1 = new Panel(); 7QhWA>1  
p2 = new Panel(); MTC<30 &  
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b0 = new Button("0"); ]FJo%?C`MG  
b1 = new Button("1"); q[VXEb  
b2 = new Button("2"); DK6Tsi=  
b3 = new Button("3"); (MjjH%W  
b4 = new Button("4"); #Y9-b
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b5 = new Button("5"); '>kP7'   
b6 = new Button("6"); 4E
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b7 = new Button("7"); gJI&%n,z  
b8 = new Button("8"); kyzAP|eh~  
b9 = new Button("9"); `5$\hXHv`A  
bPoint = new Button("."); pw5n[%  
bAdd = new Button("+"); S9 3TV~ 5  
bDec = new Button("-"); K/QSQIK  
bMul = new Button("*"); >K1|1W<&4y  
bDiv = new Button("/"); 7s/34A} #  
bCal = new Button("="); "n2 ?$  
hV~ KM?S  
tf = new TextField(25); ^ft0hl!6  
tf.setEditable(false); Kb?KEo2a\  
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} Lf7v
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public void launchFrame(){ /*2?rk  
f.setSize(220,160); 9&N N)((  
f.setResizable(false); b/HbwqK6  
f.addWindowListener(new myWindowListener()); M)6jDf2  
p1.setLayout(new FlowLayout(FlowLayout.CENTER)); +.Y@S6  
p1.add(tf); dmoqBl@z  
f.add(p1,BorderLayout.NORTH); 0Q2qxy8oe  
p2.setLayout(new GridLayout(4,4)); BMX T|n  
B!-&)  
b0.addActionListener(new setLabelText_ActionListener()); ib #R^)j+  
b1.addActionListener(new setLabelText_ActionListener()); NlOaV5&
 
b2.addActionListener(new setLabelText_ActionListener()); 1DEJ|ldv\b  
b3.addActionListener(new setLabelText_ActionListener()); _0|&/,JCCy  
b4.addActionListener(new setLabelText_ActionListener()); 5-C^jqh;  
b5.addActionListener(new setLabelText_ActionListener()); kZmY)y  
b6.addActionListener(new setLabelText_ActionListener()); J*,gSJ=  
b7.addActionListener(new setLabelText_ActionListener()); ;Rzx9h2  
b8.addActionListener(new setLabelText_ActionListener()); cnTYm  
b9.addActionListener(new setLabelText_ActionListener()); *rbeiua(j  
bPoint.addActionListener(new setLabelText_ActionListener()); PEw pn=Fb  
bAdd.addActionListener(new setOperator_ActionListener()); >hgX1kq  
bDec.addActionListener(new setOperator_ActionListener()); G:C.&8=<  
bMul.addActionListener(new setOperator_ActionListener()); 'VeW98l*]  
bDiv.addActionListener(new setOperator_ActionListener()); %~Do;k  
bCal.addActionListener(new setOperator_ActionListener()); U1
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p2.add(b7); H4G>h !  
p2.add(b8); 7<Pv  
p2.add(b9); \tr !>f  
p2.add(bAdd); ?WViOmD_  
p2.add(b4); b9c/ kIh  
p2.add(b5); Jm$ zrP
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p2.add(b6); 8) DA 6dp  
p2.add(bDec); mScjy<v  
p2.add(b1); \Op*_^KcE  
p2.add(b2); 9V!(FPD'  
p2.add(b3); A`%|6^3XT  
p2.add(bMul); @.vSz;9)  
p2.add(b0); Py{C2S*fZZ  
p2.add(bPoint); $}":l?V'>  
p2.add(bCal); A&\OGi!A3  
p2.add(bDiv); gCp ,H)- m  
f.add(p2,BorderLayout.SOUTH); t`ZN8dJ  
f.setVisible(true); |k' Kv0k  
} tYlPjZ\E  
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public void setTextFieldText_Temp(){ iXhn?_  
if (tf.getText().length()<15 && (tf.getText().indexOf(".")==-1 || !s.equals("."))){ -`8Y-2&  
tf.setText(tf.getText()+s); Jd L7)_  
}else{ E~n1S9;fX  
tf.setText((tf.getText()+s).substring(0,15)); DH}VlQ5%  
} $M=T6le  
} vEsdk}EEb  
public void setTextFieldText(){ j0-J9O?T  
if(ifOp){ 0%x&q9-le  
ifOp = false; [Nv7/_0H  
tf.setText(""); -ho$:qw]~4  
setTextFieldText_Temp(); ix9 Hh{  
}else{ UY"L]:g.  
setTextFieldText_Temp(); @O *DVee  
} B9
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} tH{``Y9M.R  
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public static void main(String[] args){ 3^={\CUh  
CalculatorGUI calculator = new CalculatorGUI(); SfPfq
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calculator.launchFrame(); [Qqf]J  
} u%kD|/u%z7  
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class myWindowListener extends WindowAdapter{ q<`_R7C~`  
public void windowClosing(WindowEvent e){ bf,m MhE;  
System.exit(0); v(psxcq?  
} h1-r^['h?  
} 9)`g#V2[8  
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class setLabelText_ActionListener implements ActionListener{ r6F"k7/3j  
public void actionPerformed(ActionEvent e){ tWtZ%brh  
Button tempB = (Button)e.getSource(); Zl @Z}  
s = tempB.getLabel(); }RJ}O~;1<P  
setTextFieldText(); W6sC)7F
 
} $t|nNfiI  
} _],1$dj  
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class setOperator_ActionListener implements ActionListener{ Z s0'<6) A  
public void actionPerformed(ActionEvent e){ H q]g@?  
Button tempB = (Button)e.getSource(); &,a.x"^T  
op = tempB.getLabel(); "EWE'E 6  
if(op.equals("+")){ k2p&FN  
tf.setText(cal.opAdd(tf.getText())); "exF2  
ifOp = true; iM!2jnA  
}else if(op.equals("-")){ Po"xj,bX  
tf.setText(cal.opSubtract(tf.getText())); i0jZ>tnH  
ifOp = true; @s2#VTP*  
}else if(op.equals("*")){ pR\
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tf.setText(cal.opMultiply(tf.getText())); Sw^)
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ifOp = true; =,S!`C?}Q  
}else if(op.equals("/")){ 6&jL6i<  
tf.setText(cal.opDivide(tf.getText())); d: xn}s  
ifOp = true; I#N"td`  
}else if(op.equals("=")){ 8C/amEU  
tf.setText(cal.opEquals(tf.getText())); C"io/MdK  
ifOp = true; n |pgOBk,  
} tcC=UT"  
} M N 89I  
} )IG]G_   
} `|6 p1Kir;  

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