10進制轉換成16進制最簡單的方法

package demo;

public class TestHex {
    private static String array[]={"0","1","2","3","4",
            "5","6","7","8","9",
            "A","B","C","D","E"};
    public  static  void main(String args[]){
        testHex(128);
    }
    
    /**
     * 將10進制轉換成16進制
     * 直接將10進制與15進行與運算(二進制中每四位為一個16進制位)
     * 0110
     * 1111
     *   &=
     * 0110
     */
    
    public static void testHex(int num){
        int temp;
        StringBuffer strb = new StringBuffer();
        for(int i=0;i<8;i++){
            temp=num&15;
            strb.append(array[temp]);
            num=num>>>4;
            
        }
        System.out.println(strb.reverse());
        //輸出結果為:00000080
    }

}