Printf声明

Question

有没有一种方法可以在此printf语句中显示的半径位于底部？到目前为止，我只显示该区域。

public class Circle 
{ 
private double radius; 
private double Area; 

public void setRadius(double rad) 
{ 
    radius = rad; 
} 

public void calculateArea() 
{ 
    Area=Math.PI*(radius*radius); 
} 

public void printArea() 
{ 
    System.out.printf("A Circle of radius has area %.4f", Area); 
    System.out.println(); 
} 
} 

Answer 1

我假设你想在打印语句中显示半径。您已经有它在该领域“半径” right..so你能不能做这样的事情

System.out.println("A Circle of radius " + radius + " has area " + Area); 

Answer 2

您可以使用下面的代码

System.out.printf("A Circle of radius %4f has area %.4f", radius, Area); 

而且有效地使用printf和format方法，只是看看documentation