关于java程序的求解过程

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能不能帮忙做一下，谢谢！

老师说：自己的作业自己做

自己动手丰衣足食

class Calc{
int a,b;
public int getA(){
return a;
}

public int getB(){
    return b;
}
public void setA(int a){
    this.a = a;
}
public void setB(int b){
    this.b = b;
}
public int addition(){
    return a+b;
}
public int subtration(){
    return a-b;
}
public int multiplication(){
    return a*b;
}
public int division(){
    return a/b;
}

}

class CalcTest
{
public static void main(String[] args)
{
Calc ca = new Calc();
ca.setA(10);
ca.setB(20);
System.out.println(ca.addition());
System.out.println(ca.subtration());
System.out.println(ca.multiplication());
System.out.println(ca.division());
}
}

运行结果截图：

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