摘要： class Circle {double radius;Circle(double r){radius=r;}double computerArea(){return 3.14*radius*radius;}void setRadius(double newRadius){radius=newRadius;}double getRadius(){return radius;}}class Cone{Circle bottom;double height;Cone(Circle c,double h){bottom=c;height=h;}double computerVolume(){doub 阅读全文

摘要： 1、向一个方法的基本数据类型参数传值class Tom {void f(int x,double y){x=x+1;y=y+1;System.out.printf("参数x和y的值分别是:%d,%3.2f\n",x,y);}}public class example4_7{public static void main(String args[]){int x=10;double y=12.58;Tom cat=new Tom();cat.f(x,y);System.out.printf("main方法中x和y的值仍然分别是：%d,%3.2f\n",x, 阅读全文

摘要： class Computer {double x,y;static double max(double a,double b){return a>b?a:b;}}class example4_6{public static void main(String args[]){double max=Computer.max(12,45);System.out.println(max);}} 阅读全文

摘要： class Tom{final int MAX=100;static final int MIN=20;}public class example4_5{public static void main(String args[]){System.out.println(Tom.MIN);Tom cat=new Tom();int x=0;x=Tom.MIN+cat.MAX;System.out.println(x);}} 阅读全文

摘要： class Lader{double above ,height;static double bottom;void setAbove(double a){above=a;}void setBottom(double b){bottom=b;}double getAbove(){return above;}double getBottom(){return bottom;}}class example4_4 {public static void main(String arg[]){Lader.bottom=60;Lader laderOne,laderTwo;System.out.prin 阅读全文

摘要： class Lader {double above,bottom,height;Lader(){}Lader(double a,double b,double h){above=a;bottom=b;height=h;}public void setAbove(double a){above=a;}public void setBottom(double b){bottom=b;}public void setHeight(double h){height=h;}double computeArea(){return (above+bottom)*height/2.0;}}public cla 阅读全文