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  1. class test {
  2.     public static int toInt(byte[] bytes, int offset) {
  3.         int ret = 0;
  4.         for (int i=0; i<4 && i+offset<bytes.length; i++) {
  5.             ret <<= 8;
  6.             ret |= (int)bytes[i] & 0xFF;
  7.         }
  8.         return ret;
  9.     }
  10.  
  11.     public static int toIntFixed(byte[] bytes, int offset) {
  12.         int ret = 0, max = offset + 4;
  13.         for (int i = offset; i < max && i < bytes.length; ++i) {
  14.             ret <<= 8;
  15.             ret |= (int)bytes[i] & 0xFF;
  16.         }
  17.         return ret;
  18.     }
  19.  
  20.     public static void main(String[] args) {
  21.         System.out.println("The original version, note that the output should be the same:");
  22.         byte[] bytes = new byte[]{-2, -4, -8, -16};
  23.         System.out.println(Integer.toBinaryString(toInt(bytes, 0)));
  24.         // 11111110111111001111100011110000 as expected
  25.  
  26.         bytes = new byte[]{-1, -2, -4, -8, -16};
  27.         System.out.println(Integer.toBinaryString(toInt(bytes, 1)));
  28.         // Expected: 11111110111111001111100011110000, should remain the same
  29.         // Got:      11111111111111101111110011111000
  30.  
  31.         System.out.println();
  32.  
  33.         System.out.println("The fixed versoin:");
  34.         bytes = new byte[]{-2, -4, -8, -16};
  35.         System.out.println(Integer.toBinaryString(toIntFixed(bytes, 0)));
  36.  
  37.         bytes = new byte[]{-1, -2, -4, -8, -16};
  38.         System.out.println(Integer.toBinaryString(toIntFixed(bytes, 1)));
  39.     }
  40. }
  41.  
Success #stdin #stdout 0.02s 245632KB
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stdin
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Standard input is empty
stdout
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The original version, note that the output should be the same:
11111110111111001111100011110000
11111111111111101111110011111000

The fixed versoin:
11111110111111001111100011110000
11111110111111001111100011110000
https://ideone.com/uCpovu
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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