不知道能不能满足你
- public static void main(String[] args) throws Exception
- {
- int shang=0,yu;
- boolean flag=false;
- System.out.println("请输入一个整数字符串(最大值为<"+Integer.MAX_VALUE+"):");
- InputStream is = System.in;
- InputStreamReader isr=new InputStreamReader(is);
- BufferedReader br=new BufferedReader(isr);
- String str=br.readLine();
- char[] ch=new char[str.length()];
- str.getChars(0, str.length(), ch, 0);
- for(int a=0;a<str.length();a++)
- {
- if(!Character.isDigit(ch[a]))
- {
- System.out.println("有非数字字符");
- System.exit(0);
- }
- }
- try
- {
- shang=Integer.parseInt(str);
- flag=true;
- }
- catch(Exception e)
- {
- System.out.println("数字过大");
- }
- str="";
- if (flag)
- {
- while (shang != 0)
- {
- yu = shang % 2;
- shang = shang / 2;
- str = yu + str;
- }
- }
- System.out.println(str);
- }
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