package ch06;
public class SimpleCalculator
{
//属性声明
private String first;//第一个操作数
private String second;//第二个操作数
private double result;//操作结果
private String operator;//操作符
/**
*以下是一些属性方法
*/
public void setFirst(String first){
this.first=first;
}
public void setSecond(String second){
this.second=second;
}
public void setOperator(String operator){
this.operator=operator;
}
public String getFirst(){
return this.first;
}
public String getSecond(){
return this.second;
}
public String getOperator(){
return this.operator;
}
//获得计算结果
public double getResult(){
return this.result;
}
/**
*根据不同的操作符进行计算
*/
public void calculate()
{
double one=Double.parseDouble(first);
double two=Double.parseDouble(second);
try{
if(operator.equals("+")) result=one+two;
else if(operator.equals("-"))result=one-two;
else if(operator.equals("*"))result=one*two;
else if(operator.equals("/"))result=one/two;
}
catch(Exception e){
System.out.println(e);
}
}
}