if(newScreen<3.5f){
System.out.println("输入错误，自动更改");
newScreen=3.5f;
}else{
screen=newScreen;
}
System.out.println("输入错误，自动更改");
newScreen=3.5f;
}else{
screen=newScreen;
}
2016-03-05
已采纳回答 / 佛曰_守口如瓶
package com.imooc;public class Initial {public static void main(String[] args) {// TODO Auto-generated method stubDog d=new Dog();d.name="xiaotian";d.age=2;d.eat();}}
2016-03-05
package com.imooc;
public class Initial {
public static void main(String[] args) {
Shape s1 = new Rectangle();
s1.girth();
s1.area();
Shape s2 = new Circle();
s2.girth();
s2.area();
}
}
public class Initial {
public static void main(String[] args) {
Shape s1 = new Rectangle();
s1.girth();
s1.area();
Shape s2 = new Circle();
s2.girth();
s2.area();
}
}
2016-03-05
package com.imooc;
public class Rectangle extends Shape {
double upside = 4; //上边
double downside = 2; //下底
public void girth() {
System.out.println("矩形的周长=" + ((upside+downside) * 2));
}
public void area() {
System.out.println("矩形的面积=" + (upside * downside));
}
}
public class Rectangle extends Shape {
double upside = 4; //上边
double downside = 2; //下底
public void girth() {
System.out.println("矩形的周长=" + ((upside+downside) * 2));
}
public void area() {
System.out.println("矩形的面积=" + (upside * downside));
}
}
2016-03-05
package com.imooc;
public class Circle extends Shape {
double r = 4; //半径
public void girth(){
System.out.println("圆形的周长=" + (2 * 3.14 * r));
}
public void area(){
System.out.println("圆形的面积=" + (3.14 * r * r));
}
}
public class Circle extends Shape {
double r = 4; //半径
public void girth(){
System.out.println("圆形的周长=" + (2 * 3.14 * r));
}
public void area(){
System.out.println("圆形的面积=" + (3.14 * r * r));
}
}
2016-03-05
package com.imooc;
public abstract class Shape {
public abstract void girth(); //周长
public abstract void area(); //面积
}
public abstract class Shape {
public abstract void girth(); //周长
public abstract void area(); //面积
}
2016-03-05