一共2个文件：
PrintBinary.java --- 打印整形的二进制格式
PrintBinaryTest.java --- 测试文件
主要内容：
打印整型的二进制格式
主要功能：
1. void printBinaryNumber(int x)
打印整型的二进制格式
文件1：PrintBinary.java
package
Common.Utils.DataUtils;
/**
* * <p> * Description: 打印整型的二进制格式 * </p> * <p> * Copyright 2006 mjn. * </p> * * @author ma jia nan * @Create Date : 2008-02-24 * @Version : 1.0
*/
public class PrintBinary
{
/** * 打印整型的二进制格式 * * @param x * @return
*/ public void printBinaryNumber(int x) { int[] buffer = new int[32]; for (int i = 0, mask = 1; i < 32; i++) { mask = 1; mask = mask << i; buffer[i] = (mask & x) >> i; } for (int j = 31; j >= 0; j--) { System.out.print(buffer[j]); if (j % 8 == 0) System.out.print(" "); } System.out.println(""); }}
import
Common.Utils.DataUtils.PrintBinary;
/** * * <p> * Description: 测试PrintBinary * </p> * <p> * Copyright 2006 mjn. * </p> * * @author ma jia nan * @Create Date : 2008-03-24 * @Version : 1.0 */
public class PrintBinaryTest
{ public static void main(String args[]) { System.out.println(s((byte) 100)); System.out.println(s((byte) 1)); System.out.println(s((byte) -1)); } private static byte s(byte b) { return new test().swap(b); } private void p(int x) { new PrintBinary().printBinaryNumber(x); } /** * 交换b二进制形式（8位）的前4位和后4位 * * @param b * @return */ public byte swap(byte b) { int lowBits = b & 0xF; int highBits = b & 0xF0; int result = lowBits << 4 | highBits >> 4; System.out.println("\n\nb=" + b + " 0xF=" + 0xF + " 0xF0=" + 0xF0); System.out.print(" b Binary : "); p(b); System.out.print(" 0xF Binary : "); p(0xF); System.out.print(" lowBits(b&0xF) : "); p((b & 0xF)); System.out.print("\n b Binary : "); p(b); System.out.print(" 0xF0 Binary : "); p(0xF0); System.out.print("highBits(b&0xF0): "); p((b & 0xF0)); System.out.print("\n lowBits << 4 : "); p((lowBits << 4)); System.out.print(" highBits >> 4 : "); p((highBits >>> 4)); System.out.print(" result( | ) : "); p((result)); return (byte) result; }}
