我要评论本文实例讲述了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。
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