java习题.docx
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java习题.docx
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java习题
1.编写Applet程序实现一个计算器,包括十个数字(0~9)按钮和四个运算符(加、减、乘、除)按钮,以及等号和清空两个辅助按钮,还有一个显示输入输出的文本框。
importjava.applet.*;
importjava.awt.*;
importjava.awt.event.*;
publicclasstest2extendsAppletimplementsActionListener
{
doublefirstOperant,secondOperant;
intcaculateStatus=0;//0:
接收操作数一;1,2:
接收操作数二;3:
等号后
charoperator;
ButtoncaculateBtn[]=newButton[16];
StringbtnLabel[]={"1","2","3","+","4","5","6","-",
"7","8","9","*","0","C","=","/"};
TextFieldinOutTfd=newTextField(50);
PanelbtnPanel=newPanel();
publicvoidinit()
{
btnPanel.setLayout(newGridLayout(4,4));
for(inti=0;i<16;i++)
{
caculateBtn[i]=newButton(btnLabel[i]);
caculateBtn[i].addActionListener(this);
btnPanel.add(caculateBtn[i]);
}
setLayout(newBorderLayout());
add("North",inOutTfd);
add("Center",btnPanel);
inOutTfd.setText("0");
caculateStatus=0;
}
publicvoidactionPerformed(ActionEventae)
{
if(ae.getSource()instanceofButton)
{
charch=((Button)(ae.getSource())).getLabel().charAt(0);
//System.out.println(ch+",status:
"+caculateStatus);
switch(ch)
{
case'C':
inOutTfd.setText("0");
firstOperant=secondOperant=0;
caculateStatus=0;
break;
case'=':
if(caculateStatus==0)
{
caculateStatus=3;
}
elseif(caculateStatus==2)
{
oneStepCaculate();
//System.out.println(firstOperant+","+secondOperant);
caculateStatus=3;
}
break;
case'+':
case'-':
case'*':
case'/':
if(caculateStatus==0||caculateStatus==3)
{
secondOperant=0;
caculateStatus=1;
}
elseif(caculateStatus==1)
{
operator=ch;
}
elseif(caculateStatus==2)
{
oneStepCaculate();
secondOperant=0;
caculateStatus=1;
}
operator=ch;
break;
default:
//数字键
if(caculateStatus==0)
{
inttemp=(int)firstOperant;
temp=temp*10+ch-'0';
inOutTfd.setText(Integer.toString(temp));
firstOperant=temp;
}
elseif(caculateStatus==1)
{
secondOperant=ch-'0';
inOutTfd.setText(Integer.toString((int)secondOperant));
caculateStatus=2;
}
elseif(caculateStatus==2)
{
inttemp=(int)secondOperant;
temp=temp*10+ch-'0';
inOutTfd.setText(Integer.toString(temp));
secondOperant=temp;
}
elseif(caculateStatus==3)
{
firstOperant=ch-'0';
inOutTfd.setText(Integer.toString((int)firstOperant));
secondOperant=0;
caculateStatus=0;
}
}//switch
}
}
publicvoidoneStepCaculate()
{
switch(operator)
{
case'+':
firstOperant+=secondOperant;
break;
case'-':
firstOperant-=secondOperant;
break;
case'*':
firstOperant*=secondOperant;
break;
case'/':
firstOperant/=secondOperant;
break;
}
inOutTfd.setText(Double.toString(firstOperant));
}}
2.根据下面的要求编程实现复数类ComplexNumber。
(1)复数类的属性包括实数部分和虚数部分
(2)复数类的方法有加法add,减法subtract
并编程验证以上的复数类。
接收用户输入的复数的实部和虚部,计算复数与复数、复数与实数的加、减的操作。
publicclasstest1
{
publicstaticvoidmain(Stringargs[])
{
ComplexNumbercNumber_1=
newComplexNumber(3,-5);
ComplexNumbercNumber_2=
newComplexNumber(2,2);
doubled=10.0;
System.out.println(cNumber_1.toString()+"加"
+cNumber_2.toString()+"等于"
+cNumber_plexAdd(cNumber_2).toString());
System.out.println(cNumber_1.toString()+"加"
+d+"等于"
+cNumber_plexAdd(d).toString());
System.out.println(cNumber_1.toString()+"减"
+cNumber_2.toString()+"等于"
+cNumber_plexMinus(cNumber_2).toString());
System.out.println(cNumber_1.toString()+"减"
+d+"等于"
+cNumber_plexMinus(d).toString());
System.out.println(cNumber_1.toString()+"乘"
+cNumber_2.toString()+"等于"
+cNumber_plexMulti(cNumber_2).toString());
System.out.println(cNumber_1.toString()+"乘"
+d+"等于"
+cNumber_plexMulti(d).toString());
}
}
classComplexNumber
{
//域
privatedoublem_dRealPart;
privatedoublem_dImaginPart;
//构造函数
ComplexNumber()
{
m_dRealPart=0.0;
m_dImaginPart=0.0;
}
ComplexNumber(doubler,doublei)
{
m_dRealPart=r;
m_dImaginPart=i;
}
ComplexNumber(ComplexNumberc)
{
m_dRealPart=c.getRealPart();
m_dImaginPart=c.getImaginaryPart();
}
//get,set方法
doublegetRealPart()
{
returnm_dRealPart;
}
doublegetImaginaryPart()
{
returnm_dImaginPart;
}
voidsetRealPart(doubled)
{
m_dRealPart=d;
}
voidsetImaginaryPart(doubled)
{
m_dImaginPart=d;
}
//复数运算方法
ComplexNumbercomplexAdd(ComplexNumberc)
{
returnnewComplexNumber(
this.m_dRealPart+c.getRealPart(),
this.m_dImaginPart+c.getImaginaryPart());
}
ComplexNumbercomplexAdd(doublec)
{
returnnewComplexNumber(
this.m_dRealPart+c,this.m_dImaginPart);
}
ComplexNumbercomplexMinus(ComplexNumberc)
{
returnnewComplexNumber(
this.m_dRealPart-c.getRealPart(),
this.m_dImaginPart-c.getImaginaryPart());
}
ComplexNumbercomplexMinus
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