JAVA中的Formatter

package com.st.day20150525;



import java.util.Formatter;



public class StringTest02 {

    /**

     *    %[argument_index$][flags][width][.precision]conversion

     *    具体的参数解释，可以查看对应的API

     */

    private static double total = 0 ;

    private static Formatter formatter = new Formatter(System.out); 

    public static void printTitle(){

        formatter.format("%-15s %-5s %-10s\n", "Item","Qty","Price");

        formatter.format("%-15s %-5s %-10s\n", "-----","---","----");

    }

    

    public static void print(String name,int qty,double price){

        formatter.format("%-15s %-5d %-10.2f\n", name,qty,price);

        total += price ;

    }

    

    public static void printTotal(){

        formatter.format("%-15s %-5s %-10.2f\n", "Tex","",total*0.6);

        formatter.format("%-15s %-5s %-10s\n", "","","-----");

        formatter.format("%-15s %-5s %-10.2f\n", "Total","",total*1.6);

    }

    public static void main(String[] args) {

        printTitle();

        print("apple", 3, 2.5);

        print("orange", 1, 1.2);

        print("banana", 10, 0.5);

        printTotal();

        

        //任何类型都可以b(布尔类型)进行转换，只有为null的时候返回false

        formatter.format("%b\n", 0);

        formatter.format("%b\n", "");

        formatter.format("%b\n", null);

        // 如果只是简单的字符串格式化，可以使用String.format 

        // 其内部实现new Formmatter对象

        System.out.println(String.format("%-15s %-5s %-10s", "我可以","做","一样的事情"));

        

    }

}