Two kinds. Also is only completes +, -, *,/the operation. GUI has only used AWT, as soon as is very simple, believes looked that could understand.
Calculator.java
The following is quotes the fragment:
public class Calculator {
private String result = “0”;
private int op = 0, add = 1, sub = 2, mul = 3, div = 4;
private double stringToDouble (String x) {
double y = Double.parseDouble(x);
return y;
}
private void operate (String x) {
double x1 = stringToDouble(x);
double y = stringToDouble(result);
switch (op) {
case 0:
result = x;
break;
case 1:
result = String.valueOf(y+x1);
break;
case 2:
result = String.valueOf(y-x1);
break;
case 3:
result = String.valueOf(y*x1);
break;
case 4:
if (x1! =0) {
result = String.valueOf(y/x1);
} else {
result = “The divisor can't be zero!”;
}
break;
}
}
public String opAdd (String x) {
operate(x);
op = add;
return result;
}
public String opSubtract (String x) {
operate(x);
op = sub;
return result;
}
public String opMultiply (String x) {
operate(x);
op = mul;
return result;
}
public String opDivide (String x) {
operate(x);
op = div;
return result;
}
public String opEquals (String x) {
operate(x);
op = 0;
return result;
}
public void opClean() {
op = 0;
result = “0”;
}
} |
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