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import java.io.*;
public class CaiPiao {
 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  String str;
  BufferedReader bufferReader = new BufferedReader(new InputStreamReader(System.in ......

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package security;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import ......

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ÓÃÃüÁî whereis java¾Í¿ÉÒÔ¿´µ½ÁË
eg:
-bash-3.1$ whereis java
java: /usr/bin/java /etc/java /usr/lib/java /usr/share/java /opt/jdk1.6.0_01/bin/java

Èç¹û½ö½öÏëÖªµÀjavaÖ´Ðз¾¶ÔÚÄÇÀïµÄ»° ÓÃwhich java¾Í¿ÉÒÔÁË
eg:
-bash-3.1$ which java
/usr/bin/java ......

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String usrHome = System.getProperty("user.home");
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Key                     Meaning
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