Java 进制转化

      import java.util.Scanner;
      public class jinzhishu {
     	/**
       * 十进制转化八进制
       */
     	public static void main(String[] args) {
     		// TODO Auto-generated method stub
      		Scanner sc=new Scanner(System.in);
     		//int n=sc.nextInt();
      		String s=sc.next();
     		//char a=s.charAt(0);
      		System.out.println(Integer.parseInt(s+" "));
     		//f(n);
      	}
     	public static void f(int n){
     		int a[]=new int[100];
     		int temp,i=0;
     		while(n>0){
      			temp=n%2;
      			a[i++]=temp;
      			n/=2;
      		}
     		for(int j=i-1;j>=0;j--){
      			System.out.print(a[j]);
      		}
      		System.out.println();
     		int result=0,l=0;
     		for(int k=0;k<i;k++){
       result+=a[k]*(int)Math.pow(2,l++);
      //System.out.println(result);
      		}
      		System.out.println(result);
      	}
      }
  
 

      import java.util.Scanner;
      public class shijinzhi {
     	/**
       * 进制转换 十--->十六
       */
     	public static void main(String[] args) {
     		// TODO Auto-generated method stub
      		Scanner sc=new Scanner(System.in);
     		int n=sc.nextInt();
      		System.out.println(Integer.toHexString(n).toUpperCase());
     		//System.out.println(Long.parseLong(n,16));
      	}
      }
  
 

      import java.util.Scanner;
      //十六-->十进制
      public class jinzhi16_10 {
      public static void main(String[] args) {
       Scanner sc = new Scanner(System.in);
       String str = sc.next();
       String[] strs = new String[str.length()];
      int t = 0;
      int j = strs.length-1;
      long sum = 0;
      for (int i=0;i<=j;i++) {
      switch(str.charAt(i)) {
      case '0':
       t = 0;
      break;
      case '1':
       t = 1;
      break;
      case '2':
       t = 2;
      break;
      case '3':
       t = 3;
      break;
      case '4':
       t = 4;
      break;
      case '5':
       t = 5;
      break;
      case '6':
       t = 6;
      break;
      case '7':
       t = 7;
      break;
      case '8':
       t = 8;
      break;
      case '9':
       t = 9;
      break;
      case 'A':
       t = 10;
      break;
      case 'B':
       t = 11;
      break;
      case 'C':
       t = 12;
      break;
      case 'D':
       t = 13;
      break;
      case 'E':
       t = 14;
      break;
      case 'F':
       t = 15;
      break;
       }
       sum = (long) (Math.pow(16,j-i)*t + sum);
       }
       System.out.println(sum);
       }
      	}
  
 

      package jichusuanfa;
      public class jinzhizhuanhuan {
      public static void main(String[] args)
       {
       toBin(6);
       toBa(60);
       toHex(60);
       }
      //十进制-->二进制 
      public static void toBin(int num)
       {
       System.out.print(num + "的二进制为:");
       trans(num, 1, 1);
       System.out.println();
       }
      //十进制-->八进制 
      public static void toBa(int num)
       {
       System.out.print(num + "的八进制为:");
       trans(num, 7, 3);
       System.out.println();
       }
      //十进制-->十六进制 
      public static void toHex(int num)
       {
       System.out.print(num + "的十六进制为:");
       trans(num, 15, 4);
       System.out.println();
       }
      public static void trans(int num, int base, int offset)
       {
      if(num == 0)
       {
       System.out.println(0);
      return;
       }
      char [] chs = {'0', '1', '2', '3',
      '4', '5', '6', '7',
      '8', '9', 'A', 'B',
      'C', 'D', 'E', 'F'};
      char [] arr = new char[32];
      int pos = arr.length;
      while(num != 0)
       {
      int temp = num & base;
       arr[--pos] = chs[temp];
       num = num >>> offset;
       }
      for(int x = pos; x < arr.length; x++)
       {
       System.out.print(arr[x]);
       }
       }
      }
  
 

文章来源: czhenya.blog.csdn.net，作者：陈言必行，版权归原作者所有，如需转载，请联系作者。

原文链接：czhenya.blog.csdn.net/article/details/77609322