将十进制转为二进制

public static void integerToBinary(Integer number){
        //使用num%2得到商和余数
        //使用上一步的商%2
        //直到商为o, 将这些余数到倒过来就是二进制

        int remainder = 0; //余数
        int quotient = 0; //商

        StringBuilder s = new StringBuilder();

        while(number > 0){
        remainder = number % 2;
        quotient = number / 2;
        s.append(Integer.toString(remainder));
        number = quotient;
        }

        System.out.println(s.reverse().toString()); //将字符串倒过来
    }

public static void integerToBinaryUseStack(Integer number){
        //使用num%2得到商和余数
        //使用上一步的商%2
        //直到商为o

        int remainder = 0; //余数
        int quotient = 0; //商

        Stack<Integer> stack = new Stack<Integer>();

        while(number > 0){
            remainder = number % 2;
            quotient = number / 2;
            stack.push(remainder);
            number = quotient;
        }

        while (!stack.empty()){
            System.out.print(stack.pop()); //哈哈, 使用队列后进先出的特点
        }
    }

测试代码

public static void main(String[] args) {

        //6的2进制数为110
//        System.out.println(6%2); //3 0
//        System.out.println(3/2); //1 1
//        System.out.println(1%2); //0 1

        integerToBinary(6); //110
        integerToBinaryUseStack(6);  //110
    }

来源：https://blog.csdn.net/csdnLeraner/article/details/100165901