?? thread_lock_be_modify.java
字號:
package thread_lock_be_modify;
import java.util.Vector;
public class Thread_lock_be_modify {
private static final class Thread_lock_be_modifyHolder {
private static Thread_lock_be_modify theSingleton = new Thread_lock_be_modify();
public static Thread_lock_be_modify getSingleton() {
return theSingleton;
}
public static Thread_lock_be_modify getInstance() {
return Thread_lock_be_modifyHolder.getSingleton();
}
private Thread_lock_be_modifyHolder() {
}
}
private Vector ve = null;
private Object lock = new Object();
private Thread_lock_be_modify() {
ve = new Vector();
initialize();
}
public void reload() {
synchronized (lock) {
ve = null;
ve = new Vector();
// lock="abc";
for (int i = 0; i < 100; i++) {
ve.add(String.valueOf(i));
}
}
System.out.println("reload end");
}
private void initialize() {
for (int i = 0; i < 100; i++) {
ve.add(String.valueOf(i));
}
}
public boolean checkValid(String str) {
synchronized (lock) {
System.out.println(ve.size());
return ve.contains(str);
}
}
}
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