hejiaqi 2 years ago
commit 8e53689806

@ -39,7 +39,7 @@ import java.io.PrintStream;
public class BackupUtils {
private static final String TAG = "BackupUtils";
// Singleton stuff
private static BackupUtils sInstance; //类里面为什么可以定义自身类的对象?
private static BackupUtils sInstance;
public static synchronized BackupUtils getInstance(Context context) {
//ynchronized 关键字,代表这个方法加锁,相当于不管哪一个线程例如线程A

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