?? round.java
字號:
package zuoye.entity;
public class Round extends Shape {
private final double PI = 3.14;
private double r;
public Round(double r) {
super();
this.r = r;
}
public Round() {
super();
// TODO Auto-generated constructor stub
}
public double girth(){// 2 PI r
return 2*PI*r;
}
public void area(){//PI r*r
System.out.println(PI*r*r);
}
}
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