Java实现复杂的进制转换器功能示例

本文实例讲述了java实现复杂的进制转换器功能。分享给大家供大家参考，具体如下：

这是用java写的进制转换器，包括10、2、8、16进制之间共12种的相互转换。输入一个要转换的数之后，按提示选择所采用的转换方式，输出转换的结果。

注:新上传的文件是在此前代码（下面的3. 原java代码）的基础上做了改进，能更好地实现封装。

1. systemconvert.java

package day8;
import java.util.scanner;
public class systemconvert {
  static scanner scanner = new scanner(system.in);
  static string s = "";
  // 定义10进制转2进制的方法。
  public static string c10t2(int numb) {
    string result = "";
    for (int i = numb; i > 0; i /= 2)
      result = i % 2 + result;
    return result;
  }
  // 定义10进制转8进制的方法。
  public static string c10t8(int numb) {
    string result = "";
    for (int i = numb; i > 0; i /= 8)
      result = i % 8 + result;
    return result;
  }
  // 定义2进制转10进制的方法。
  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;
  }
  // 定义8进制转10进制的方法。
  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("要转的是16进制数吗？\n输入1。代表是；\n输入2.代表不是.\n");
    int input = scanner.nextint();
    switch (input) {
    case 1:
      system.out.println("请输入一个16进制数：");
      string numb = scanner.next();
      system.out.println("转成什么进制的数？");
      int to = scanner.nextint();
      convert(numb, 16, to);
      break;
    case 2:
      system.out.println("请输入一个数：");
      int numb2 = scanner.nextint();
      system.out.println("从什么进制数转起？");
      int from = scanner.nextint();
      system.out.println("转成什么进制的数？");
      int to2 = scanner.nextint();
      convert(numb2, from, to2);
      break;
    default:
      system.out.println("wrong input!");
    }
  }
}

2. 运行效果截图：

3. 原java代码

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输入1，表示10进制转2进制;\n"
        + "输入2，表示2进制转10进制;\n" + "输入3，表示10进制转8进制;\n"
        + "输入4，表示8进制转10进制;\n" + "输入5，表示10进制转16进制;\n"
        + "输入6，表示16进制转10进制;\n" + "输入7，表示2进制转8进制;\n"
        + "输入8，表示2进制转16进制;\n" + "输入9，表示8进制转2进制;\n"
        + "输入10，表示8进制转16进制;\n" + "输入11，表示16进制转2进制;\n"
        + "输入12，表示16进制转8进制;\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. 运行截图：

ps：这里再为大家推荐几款本站的在线进制转换与计算工具，相信对于大家能有所帮助：

在线任意进制转换工具：

在线标准计算器：

在线科学计算器：

希望本文所述对大家java程序设计有所帮助。