int a = 357;
//十进制转成二进制
System.out.println(Integer.toBinaryString(a));

package com.swift;

import java.util.Scanner;

public class Decimal2Binary {

    public static void main(String[] args) {
        Scanner scan=new Scanner(System.in);
        System.out.println("please enter a Integer:");
        int integer=scan.nextInt();
        String octal=Integer.toBinaryString(integer);
        System.out.println(octal);
    }
}

//十进制转成八进制

System.out.println(Integer.toOctalString(a));

package com.swift;

import java.util.Scanner;

public class Decimal2Octal {

    public static void main(String[] args) {
        Scanner scan=new Scanner(System.in);
        System.out.println("please enter a Integer:");
        int integer=scan.nextInt();
        String octal=Integer.toOctalString(integer);
        System.out.println(octal);
    }
}

//十进制转成十六进制

System.out.println(Integer.toHexString(a));

import java.util.Scanner;

public class Decimal2Hex {

    public static void main(String[] args) {
        Scanner scan=new Scanner(System.in);
        System.out.println("please enter a Integer:");
        int integer=scan.nextInt();
        String hex=Integer.toHexString(integer);
        System.out.println(hex);
    }
}