重寫 toBinaryString() 方法

• 重寫 toBinaryString() 方法：

• public class Main {
      
      public static void main(String[] args) {
          int i1 = 0xaaaaaaaa;
          int i2 = 0x55555555;
          System.out.println("i1 = " + toBinaryString(i1));
          System.out.println("i2 = " + toBinaryString(i2));
          System.out.println("~i1 = " + toBinaryString(~i1));
          System.out.println("~i2 = " + toBinaryString(~i2));
          System.out.println("i1 & i2 = " + toBinaryString(i1 & i2));
          System.out.println("i1 | i2 = " + toBinaryString(i1 | i2));
          System.out.println("i1 ^ i2 = " + toBinaryString(i1 ^ i2));
          System.out.println("i1 & i1 = " + toBinaryString(i1 & i1));
          System.out.println("i1 | i1 = " + toBinaryString(i1 | i1));
          System.out.println("i1 ^ i1 = " + toBinaryString(i1 ^ i1));
          System.out.println("i2 & i2 = " + toBinaryString(i2 & i2));
          System.out.println("i2 | i2 = " + toBinaryString(i2 | i2));
          System.out.println("i2 ^ i2 = " + toBinaryString(i2 ^ i2));
      }
  
      private static String toBinaryString(int i) {
          StringBuilder sb = new StringBuilder();
  
          do {
              // 在開頭插入
              sb.insert(0, ((i & 0x01) != 0) ? '1' : '0');
              i >>>= 1;
          } while (i != 0);
          return sb.toString();
      }
  }