Java實現復雜的進制轉換器功能示例

更新時間：2017年01月03日 08:54:41 作者：aitaoke

這篇文章主要介紹了Java實現復雜的進制轉換器功能,結合實例形式分析了java數學運算的相關實現技巧,需要的朋友可以參考下

本文實例講述了Java實現復雜的進制轉換器功能。分享給大家供大家參考，具體如下：

這是用java寫的進制轉換器，包括10、2、8、16進制之間共12種的相互轉換。輸入一個要轉換的數之后，按提示選擇所采用的轉換方式，輸出轉換的結果。

注:新上傳的文件是在此前代碼（下面的3. 原java代碼）的基礎上做了改進，能更好地實現封裝。

1. SystemConvert.java

package day8;
import java.util.Scanner;
public class SystemConvert {
  static Scanner scanner = new Scanner(System.in);
  static String s = "";
  // 定義10進制轉2進制的方法。
  public static String C10T2(int numb) {
    String result = "";
    for (int i = numb; i > 0; i /= 2)
      result = i % 2 + result;
    return result;
  }
  // 定義10進制轉8進制的方法。
  public static String C10T8(int numb) {
    String result = "";
    for (int i = numb; i > 0; i /= 8)
      result = i % 8 + result;
    return result;
  }
  // 定義2進制轉10進制的方法。
  public static int C2T10(int numb) {
    int k = 0, result = 0;
    // String result=null;
    for (int i = numb; i > 0; i /= 10) {
      result += (i % 10) * Math.pow(2, k);
      k++;
    }
    return result;
  }
  // 定義8進制轉10進制的方法。
  public static int C8T10(int numb) {
    int k = 0, temp = 0;
    for (int i = numb; i > 0; i /= 10) {
      temp += (i % 10) * Math.pow(8, k);
      k++;
    }
    return temp;
  }
  public static void convert10(int numb, int to) {
    String s = "";
    switch (to) {
    case 2:
      s = "" + C10T2(numb);
      break;
    case 8:
      s = "" + C10T8(numb);
      break;
    case 16:
      s = Integer.toHexString(numb).toUpperCase();
      break;
    default:
      System.out.println("wrong input!");
    }
    System.out.println(s);
  }
  public static void convert2(int numb, int to) {
    String s = "";
    switch (to) {
    case 10:
      s = "" + C2T10(numb);
      break;
    case 8:
      s = "" + C10T8(C2T10(numb));
      break;
    case 16:
      s = Integer.toHexString(C2T10(numb)).toUpperCase();
      break;
    default:
      System.out.println("wrong input!");
    }
    System.out.println(s);
  }
  public static void convert8(int numb, int to) {
    String s = "";
    switch (to) {
    case 2:
      s = "" + C10T2(C8T10(numb));
      break;
    case 10:
      s = "" + C8T10(numb);
      break;
    case 16:
      s = Integer.toHexString(C8T10(numb)).toUpperCase();
      break;
    default:
      System.out.println("wrong input!");
    }
    System.out.println(s);
  }
  public static void convert16(String numb, int to) {
    String s = "";
    switch (to) {
    case 2:
      int temp2 = Integer.parseInt(numb, 16);
      s = C10T2(temp2);
      break;
    case 8:
      int temp3 = Integer.parseInt(numb, 16);
      s = C10T8(temp3);
      break;
    case 10:
      int temp = Integer.parseInt(numb, 16);
      s = "" + temp;
      break;
    default:
      System.out.println("wrong input!");
    }
    System.out.println(s);
  }
  public static void convert(int numb, int from, int to) {
    switch (from) {
    case 10:
      convert10(numb, to);
      break;
    case 2:
      convert2(numb, to);
      break;
    case 8:
      convert8(numb, to);
      break;
    default:
      System.out.println("wrong input!");
    }
  }
  public static void convert(String numb, int from, int to) {
    switch (from) {
    case 16:
      convert16(numb, to);
      break;
    default:
      System.out.println("wrong input!");
    }
  }
  public static void main(String[] args) {
    System.out.println("要轉的是16進制數嗎？\n輸入1。代表是；\n輸入2.代表不是.\n");
    int input = scanner.nextInt();
    switch (input) {
    case 1:
      System.out.println("請輸入一個16進制數：");
      String numb = scanner.next();
      System.out.println("轉成什么進制的數？");
      int to = scanner.nextInt();
      convert(numb, 16, to);
      break;
    case 2:
      System.out.println("請輸入一個數：");
      int numb2 = scanner.nextInt();
      System.out.println("從什么進制數轉起？");
      int from = scanner.nextInt();
      System.out.println("轉成什么進制的數？");
      int to2 = scanner.nextInt();
      convert(numb2, from, to2);
      break;
    default:
      System.out.println("wrong input!");
    }
  }
}

2. 運行效果截圖：

3. 原java代碼

import java.util.Scanner;
public class SystemConvert {
  static Scanner scanner = new Scanner(System.in);
  static String s = "";
  public static void convert() {
    System.out.println("please input a number:");
    String numb = scanner.next();
    System.out.println("choose a way:\n輸入1，表示10進制轉2進制;\n"
        + "輸入2，表示2進制轉10進制;\n" + "輸入3，表示10進制轉8進制;\n"
        + "輸入4，表示8進制轉10進制;\n" + "輸入5，表示10進制轉16進制;\n"
        + "輸入6，表示16進制轉10進制;\n" + "輸入7，表示2進制轉8進制;\n"
        + "輸入8，表示2進制轉16進制;\n" + "輸入9，表示8進制轉2進制;\n"
        + "輸入10，表示8進制轉16進制;\n" + "輸入11，表示16進制轉2進制;\n"
        + "輸入12，表示16進制轉8進制;\n");
    int input = scanner.nextInt();
    switch (input) {
    case 1: // 10>>>2
      s = "" + C10T2(numb);
      break;
    case 2: // 2>>>10
      s += C2T10(numb);
      break;
    case 3: // 10>>>8
      s = "" + C10T8(numb);
      break;
    case 4: // 8>>>10
      s = "" + C8T10(numb);
      break;
    case 5: // 10>>>16
      s = Integer.toHexString(Integer.valueOf(numb)).toUpperCase();
      break;
    case 6:// 16>>>10
      int temp = Integer.parseInt(numb, 16);
      s = "" + temp;
      break;
    case 7: // 2>>>8
      s = "" + C10T8(Integer.toString(C2T10(numb)));
      break;
    case 8: // 2>>>16
      s = Integer.toHexString(Integer.valueOf(C2T10(numb))).toUpperCase();
      break;
    case 9: // 8>>>2
      s = "" + C10T2(Integer.toString(C8T10(numb)));
      break;
    case 10:// 8>>>16
      s = Integer.toHexString(Integer.valueOf(C8T10(numb))).toUpperCase();
      break;
    case 11:// 16>>>2
      int temp2 = Integer.parseInt(numb, 16);
      s = Integer.toBinaryString(temp2);
      break;
    case 12:// 16>>>8
      int temp3 = Integer.parseInt(numb, 16);
      s = C10T8(Integer.toString(temp3));
      break;
    default:
      System.out.println("Wrong input!");
    }
    System.out.println(s);
  }
  public static int C2T10(String numb) {
    int k = 0, result = 0;
    // String result=null;
    for (int i = Integer.valueOf(numb); i > 0; i /= 10) {
      result += (i % 10) * Math.pow(2, k);
      k++;
    }
    return result;
  }
  public static int C8T10(String numb) {
    int k = 0, temp = 0;
    for (int i = Integer.valueOf(numb); i > 0; i /= 10) {
      temp += (i % 10) * Math.pow(8, k);
      k++;
    }
    return temp;
  }
  public static String C10T8(String numb) {
    String result = "";
    for (int i = Integer.valueOf(numb); i > 0; i /= 8)
      result = i % 8 + result;
    return result;
  }
  public static String C10T2(String numb) {
    String result = "";
    for (int i = Integer.valueOf(numb); i > 0; i /= 2)
      result = i % 2 + result;
    return result;
  }
  public static void main(String[] args) {
    SystemConvert.convert();
  }
}

4. 運行截圖：