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：
http://tools.VeVB.COm/transcoding/hexconvert
在线标准计算器：
http://tools.VeVB.COm/jisuanqi/jsq
在线科学计算器：
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希望本文所述对大家java程序设计有所帮助。