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
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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!");
}
}
}
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2. 运行效果截图：
3. 原java代码
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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();
}
}
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4. 运行截图：
希望本文所述对大家java程序设计有所帮助。