1 递归

    /*** 递归：十进制转二进制* @param decimal 待转换的十进制数* @param binary  转换后的二进制数*/public static void decimalToBinaryByRecursion(int decimal,StringBuilder binary){if(decimal <= 0){return;}decimalToBinaryByRecursion(decimal/2,binary);binary.append(decimal % 2);}

2 循环

    /*** 循环：十进制转二进制* @param decimal 十进制数* @return 转换后的二进制数*/public static String decimalToBinaryByCirculate(int decimal){String binary="";while (decimal > 0){int temp=decimal%2;binary=temp+binary;decimal=decimal/2;}return binary;}

3 位运算

    /*** 位运算：十进制转二进制* @param decimal 十进制数* @return 转换后的二进制数*/public static String decimalToBinaryByBitwise(int decimal){StringBuilder binary = new StringBuilder();while (decimal > 0) {binary.append(decimal & 1);decimal >>>= 1;}return binary.reverse().toString();}

4 测试程序

    public static void main(String[] args) {int decimalData=25;StringBuilder binary=new StringBuilder();decimalToBinaryByRecursion(decimalData,binary);System.out.print("递归:");System.out.println(binary);System.out.print("循环:");System.out.println(decimalToBinaryByCirculate(decimalData));System.out.print("位运算:");System.out.println(decimalToBinaryByBitwise(decimalData));}

5 运行结果