java作业1.docx

1、packagewh;

publicclasssjx{
publicdoubledb;
publicdoublegao;

publicsjx(doubledb,doublegao){
this.db=db;
this.gao=gao;
}

publicdoublemianji(){
return(db*gao/2);
}
publicstaticdoublesjxmianji(doubledi,doubleh){
return(di*h/2);

}

}

2、packagewh;

publicclasstestsjx{

/**
*@paramargs
*/
publicstaticvoidmain(String[]args){
//TODOAuto-generatedmethodstub
sjxsjx=newsjx(2,4);

doublemj=sjx.mianji();
System.out.println("三角形的面积="+mj);

mj=sjx.sjxmianji(3,4);
System.out.println("三角形的面积="+mj);
}

}
三角形的面积=4.0
三角形的面积=6.0

3、packagewh;

publicclassYZ{
publicdoublebj;
finalpublicdoublePI=3.14;
publicdoublegao;

publicYZ(){

}

publicYZ(doublebj,doublegao){
this.bj=bj;

this.gao=gao;

}

publicdoublecemianji(){
return(2*PI*bj*gao);

}

}
4、packagewh;

importwh.YZ;

publicclasstestYZ{

/**
*@paramargs
*/
publicstaticvoidmain(String[]args){
//TODOAuto-generatedmethodstub
doublebanjing=2;
doubleh=2;

YZyz=newYZ(banjing,h);

System.out.println("圆柱的侧面积="+yz.cemianji());
}}
圆柱的侧面积=25.12

5、packagewh;

publicclasspanduan{
publicstaticvoidpanduan(doublea){
if(a<60){
System.out.println("不及格");
}
if(a>=60){
System.out.println("及格");
}
if(a<=80){
System.out.println("良");
}
if(a>80){
System.out.println("优");
}
}

}
6、packagewh;

publicclasstestpanduan{

/**
*@paramargs
*/
publicstaticvoidmain(String[]args){
//TODOAuto-generatedmethodstub
panduanb=newpanduan();

b.panduan(90);

}

}
及格
优
7、packagewh;

publicclasszfx{
publicdoublebc;

publiczfx(doublea){
a=bc;
}

publicdoublemianji(){
return(bc*bc);
}

publicstaticdoublezfxmianji(doubleb){
return(b*b);

}

}
8、packagewh;

importwh.zfx;

publicclasstestzfx{

/**
*@paramargs
*/
publicstaticvoidmain(String[]args){
//TODOAuto-generatedmethodstub
doubleb=2;
zfxzfx=newzfx(2);

doublemj=zfx.mianji();

System.out.println("正方形的面积="+mj);

mj=zfx.zfxmianji(2);

System.out.println("正方