formatvalue.java

编程之道--java程序设计入门源代码

/**
 *　通过这个程序，测试格式器的使用方法
 */
import java.text.NumberFormat;
import java.util.Locale;

public class FormatValue
{
	public static void main(String[] args)
	{
		double x = 100000.0/3;
		System.out.println("the value is: " + x);
		//首先以默认地区的格式器来输出
		System.out.println("接下来输出的是美国地区的格式器的结果：");
		NumberFormat number = NumberFormat.getNumberInstance(Locale.US);
		NumberFormat currency = NumberFormat.getCurrencyInstance(Locale.US); 
		NumberFormat percent = NumberFormat.getPercentInstance(Locale.US);
		
		FormatValue fm = new FormatValue();
		fm.print(number, x);
		fm.print(currency, x);
		fm.print(percent, x);

		System.out.println("接下来输出的是默认地区的格式器的结果:");
		NumberFormat nu = NumberFormat.getNumberInstance();
		NumberFormat cu = NumberFormat.getCurrencyInstance();
		NumberFormat pe = NumberFormat.getPercentInstance();
		fm.print(nu, x);
		fm.print(cu, x);
		fm.print(pe, x);
	}

	public void print(NumberFormat nu, double x)
	{
		System.out.println(nu.format(x));
	}	
}