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Integer var = new Integer();//ÓÐÓï·¨´íÎó
Integer var = new Integer(2);//悦﵀
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Vector v = new Vector();
v.add("aaaaaaaa");
v.add("bbbbbbbbbbbb");
for (Enumeration e = v.elements(); e.hasMoreElements();)
{
System.out.println(e.nextElement());
}
//Êä³ö
//aaaaaaaa
//bbbbbbbbbbbb
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String[] names=f.list(new FilenameFilter()//µÃµ½ÒÔÉÏÎļþ¼ÐÏÂËùÓеÄÎļþÃûºÍĿ¼Ãû,´æ´¢ÔÚnamesÊý×éÖÐ
{
public boolean accept(File dir,String name)
{
return name.indexOf(".java")!=-1;
}
});
getClass().getName();
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1. import java.util.*;
2.(A) public class Test
{ public static void main(String[] args)
{
//Éú³É [0-n) ¸ö²»Öظ´µÄËæ»úÊý st ÓÃÀ´±£´æ ......
package sort;
public class RadixSort {
// Çóx ÊýµÚdλÉϵÄÊý×Ö£¬ÀýÈç12345£¬Ê®Î»Êý×ÖÊÇ4 12345/10%10=4
// d=0 ±íʾ¸öλ £»d=1 ±íʾʮλ...ÒÀ´ÎÀàÍÆ
public static int digit(int d,int x){
return x/(int)Math.pow(10, d)%10;
}
public static void ra ......
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WL-Proxy-Client-IP=211.161.1.239
......
import java.io.*;
class FileTest
{
public static void main(String[] args) throws Exception
{
//File f=new File("1.txt");
//f.createNewFile();
//f.mkdir();
//File f=new File("E:\\JavaLesson\\Lesson7\\1.txt");//ÔÚWindowsϵͳÏÂ,Óþø¶Ô ......