JAVA×Ö·û´®²Ù×÷
1¡¢ public class HelloWorld {
public static void main(String args[]){
String s="daxiong";
System.out.println("Hello,World!"+"lu shenglong"+s);
char c[]={'s','w','q'};
String u=new String(c);
System.out.println(u);
char ch;
ch=u.charAt(1); //×Ö·û½ØÈ¡º¯Êý
System.out.println(ch);
char cha[]=new char[3];
cha=u.toCharArray();
for(int i=0;i<3;i++)
System.out.print(cha[i]+"¡¢");
}
}
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Hello,World!lu shenglongdaxiong
swq
w
s¡¢w¡¢q¡¢
2¡¢JAVAÖГ==”±È½ÏµÄÊǶÔÏóµÄµØÖ·£¬¶øequals()·½·¨±È½ÏµÄÊǶÔÏóµÄÖµ¡£
3¡¢ÐÞ¸Ä×Ö·û´® String e="windows".replace('w','q'); Êä³ö£ºqindoqs
4¡¢trim()·½·¨£º¸Ã·½·¨·µ»ØÒ»¸öµ÷ÓÃ×Ö·û´®µÄ¿½±´£¬½«Î»ÓÚ×Ö·û´®Ç°ÃæºÍºóÃæµÄ¿Õ°××Ö·ûɾȥ£¬Ò»°ãÐÎʽÈçÏ£ºString s=" hello world ".trim();
Êä³ö½á¹ûΪ£ºhello world
Ó¦ÓÃʵÀý;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class Test {
public static void main(String args[]) throws IOException{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
String str;
System.out.println("Enter'stop'to quit;");
System.out.println("Enter Name:");
do{
str=br.readLine();
str=str.trim();
if(str.equals("Tom"))
System.out.println("Tom is 10 years old.");
}while(!str.equals("stop"));
}
}
Êä³ö£ºEnter'stop'to quit;
Enter Name:
Tom
Tom i
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import java.io.*;
public class FileToString {
public static String readFile(String fileName) {
String output = "";
File file = new File(fileName);
if(file.exists()){
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°ücommons-net-1.4.1.zip
import org.apache.commons.io.IOUtils;
import org.apache.commons.net.ftp.FTPClient;
import com.eduvideotv.util.Global;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.FileOutputStream;
/**
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