mytextdocument.java

随机生成35选7彩票码

package sjs;

import javax.swing.text.*;

public class MyTextDocument extends PlainDocument {
    private int maxlenth;
    private String flag;
    public MyTextDocument(int maxlen)
    {
     this(maxlen,null);
     }
    public MyTextDocument(int maxlen,String flagstate)
       {
       super();
       maxlenth=maxlen;
       flag=flagstate;


        }
synchronized   public void insertString(int offs, String str, AttributeSet a)
	    throws BadLocationException {

      if(str == null)
        {
         return;
         }
	    else if (offs>=maxlenth){
          return;
          }
        else if(flag=="int")
           {
            char[] upper = str.toCharArray();
            for (int i = 0; i < upper.length; i++) {
	 	          if((upper[i]<'0'||upper[i]>'9')&&(upper[0]!='-'))
               return;
	             }
            super.insertString(offs, new String(upper), a);
           }
          else if(flag=="float")
           {
            char[] upper = str.toCharArray();
	          for (int i = 0; i < upper.length; i++) {
	 	          if((upper[i]<'0'||upper[i]>'9')&&upper[i]!='.'&&upper[i]!='-')
               return;
	             }
	          super.insertString(offs, new String(upper), a);
           }
           else
             super.insertString(offs, str, a);

         }
}