试试吧。如果作用域仅打印给定整数值的二进制值。它可以是正的，也可以是负的。

      public static void printBinaryNumbers(int n) {
        char[] arr = Integer.toBinaryString(n).toCharArray();
        StringBuilder sb = new StringBuilder();
        for (Character c : arr) {
          sb.append(c);
        }
        System.out.println(sb);
      }

输入

5

输出

101

解决方案使用32位显示掩码，

public static String toBinaryString(int n){

    StringBuilder res=new StringBuilder();
    //res= Integer.toBinaryString(n); or
    int displayMask=1<<31;
    for (int i=1;i<=32;i++){
        res.append((n & displayMask)==0?'0':'1');
        n=n<<1;
        if (i%8==0) res.append(' ');
    }

    return res.toString();
}


 System.out.println(BitUtil.toBinaryString(30));


O/P:
00000000 00000000 00000000 00011110 

System.out.println(Integer.toBinaryString(343));

    for(int i = 1; i <= 256; i++)
    {
        System.out.print(i + " "); //show integer
        System.out.println(Integer.toBinaryString(i) + " "); //show binary
        System.out.print(Integer.toOctalString(i) + " "); //show octal
        System.out.print(Integer.toHexString(i) + " "); //show hex

    }

它使用强大的位操作处理有符号和无符号值，并生成左边的第一个零。

public static String representDigits(int num) {

        int checkBit = 1 << (Integer.SIZE * 8 - 2 );    // avoid the first digit        
        StringBuffer sb = new StringBuffer();

        if (num < 0 ) {     // checking the first digit
            sb.append("1");
        } else {
            sb.append("0");
        }

        while(checkBit != 0) {          
            if ((num & checkBit) == checkBit){
                sb.append("1");
            } else {
                sb.append("0");
            }           
            checkBit >>= 1;     
        }       

        return sb.toString();
    }

public static void main(String[] args) 
{
    int i = 13;
    short s = 13;
    byte b = 13;

    System.out.println("i: " + String.format("%32s", 
            Integer.toBinaryString(i)).replaceAll(" ", "0"));

    System.out.println("s: " + String.format("%16s", 
            Integer.toBinaryString(0xFFFF & s)).replaceAll(" ", "0"));

    System.out.println("b: " + String.format("%8s", 
            Integer.toBinaryString(0xFF & b)).replaceAll(" ", "0"));

}

输出:

i: 00000000000000000000000000001101
s: 0000000000001101
b: 00001101