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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