Java: Class Variable/Static Variable

最新推荐文章于 2025-05-27 15:43:17 发布
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本文详细介绍了静态变量的概念，包括其别称、存储位置、生命周期及如何访问。解释了静态变量类似于常量的特点，无论创建多少个对象，每个类仅有一份静态变量副本。

1. Class variable is also known as static variable with "static" keyword inside the class but outside the methods.

2. There is only one copy of class variable is no matter how many objects are initiated from this class.

3. Class variable is accessed as: className.classVariableName.

4. Static variable is pretty like constant, declared with key word "static", stored in static memory, created when program begins and destroyed when program ends.



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报错FAILED: out/target/common/obj/JAVA_LIBRARIES/framework_intermediates/classes-full-debug.jar /bin/bash out/target/common/obj/JAVA_LIBRARIES/framework_intermediates/classes-full-debug.jar.rsp frameworks/base/core/java/android/os/NvRAMAgent.java:261: error: class, interface, or enum expected public byte[] readFile(int file_lid) throws android.os.RemoteException; ^ frameworks/base/core/java/android/os/NvRAMAgent.java:262: error: class, interface, or enum expected public int writeFile(int file_lid, byte[] buff) throws android.os.RemoteException; ^ frameworks/base/core/java/android/os/NvRAMAgent.java:263: error: class, interface, or enum expected public byte[] readFileByName(String filename) throws android.os.RemoteException; ^ frameworks/base/core/java/android/os/NvRAMAgent.java:264: error: class, interface, or enum expected public int writeFileByName(String filename, byte[] buff) throws android.os.RemoteException; ^ frameworks/base/core/java/android/os/NvRAMAgent.java:265: error: class, interface, or enum expected } ^ 5 errors [ 0% 10/1589] Building with Jack: out/target/common/obj/JAVA_LIBRARIES/framework_intermediates/with-local/classes.dex FAILED: out/target/common/obj/JAVA_LIBRARIES/framework_intermediates/with-local/classes.dex /bin/bash out/target/common/obj/JAVA_LIBRARIES/framework_intermediates/with-local/classes.dex.rsp ERROR: /home/server1/server1/fyc/mt6580_go/alps/frameworks/base/core/java/android/os/NvRAMAgent.java:50.31: The public type Stub must be defined in its own file ERROR: /home/server1/server1/fyc/mt6580_go/alps/frameworks/base/core/java/android/os/NvRAMAgent.java:50.31: Illegal modifier for the class Stub; only public, abstract & final are permitted ERROR: /home/server1/server1/fyc/mt6580_go/alps/frameworks/base/core/java/android/os/NvRAMAgent.java:50.73: NvRAMAgent cannot be resolved to a type ERROR: /home/server1/server1/fyc/mt6580_go/alps/frameworks/base/core/java/android/os/NvRAMAgent.java:56.9: The method attachInterface(IInterface, String) in the type Binder is not applicable for the arguments (Stub, String) ERROR: /home/server1/server1/fyc/mt6580_go/alps/frameworks/base/core/java/android/os/NvRAMAgent.java:63.17: NvRAMAgent cannot be resolved to a type ERROR: /home/server1/server1/fyc/mt6580_go/alps/frameworks/base/core/java/android/os/NvRAMAgent.java:70.38: NvRAMAgent cannot be resolved to a type ERROR: /home/server1/server1/fyc/mt6580_go/alps/frameworks/base/core/java/android/os/NvRAMAgent.java:71.14: NvRAMAgent cannot be resolved to a type ERROR: /home/server1/server1/fyc/mt6580_go/alps/frameworks/base/core/java/android/os/NvRAMAgent.java:74.15: NvRAMAgent cannot be resolved to a type ERROR: /home/server1/server1/fyc/mt6580_go/alps/frameworks/base/core/java/android/os/NvRAMAgent.java:144.41: NvRAMAgent cannot be resolved to a type ERROR: /home/server1/server1/fyc/mt6580_go/alps/frameworks/base/core/java/android/os/NvRAMAgent.java:255.42: IBinder cannot be resolved to a variable ERROR: /home/server1/server1/fyc/mt6580_go/alps/frameworks/base/core/java/android/os/NvRAMAgent.java:256.43: IBinder cannot be resolved to a variable ERROR: /home/server1/server1/fyc/mt6580_go/alps/frameworks/base/core/java/android/os/NvRAMAgent.java:257.48: IBinder cannot be resolved to a variable ERROR: /home/server1/server1/fyc/mt6580_go/alps/frameworks/base/core/java/android/os/NvRAMAgent.java:258.49: IBinder cannot be resolved to a variable ERROR: /home/server1/server1/fyc/mt6580_go/alps/frameworks/base/core/java/android/os/NvRAMAgent.java:260.2: Syntax error on token "}", delete this token ERROR: /home/server1/server1/fyc/mt6580_go/alps/frameworks/base/core/java/android/os/NvRAMAgent.java:261.15: This method requires a body instead of a semicolon ERROR: /home/server1/server1/fyc/mt6580_go/alps/frameworks/base/core/java/android/os/NvRAMAgent.java:262.12: This method requires a body instead of a semicolon ERROR: /home/server1/server1/fyc/mt6580_go/alps/frameworks/base/core/java/android/os/NvRAMAgent.java:263.15: This method requires a body instead of a semicolon ERROR: /home/server1/server1/fyc/mt6580_go/alps/frameworks/base/core/java/android/os/NvRAMAgent.java:264.12: This method requires a body instead of a semicolon ERROR: /home/server1/server1/fyc/mt6580_go/alps/frameworks/base/core/java/android/os/NvRAMPROINFOUtils.java:129.22: android.os.NvRAMAgent cannot be resolved ERROR: /home/server1/server1/fyc/mt6580_go/alps/frameworks/base/core/java/android/os/NvRAMPROINFOUtils.java:144.8: android.os.KSTHandleCharsCheck cannot be resolved to a type ERROR: /home/server1/server1/fyc/mt6580_go/alps/frameworks/base/core/java/android/os/NvRAMPROINFOUtils.java:149.4: android.os.NvRAMAgent cannot be resolved to a type ERROR: /home/server1/server1/fyc/mt6580_go/alps/frameworks/base/core/java/android/os/NvRAMPROINFOUtils.java:149.34: android.os.NvRAMAgent cannot be resolved
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private static class Proxy implements NvRAMAgent { private IBinder mRemote; Proxy(IBinder remote) { mRemote = remote; } @Override public IBinder asBinder() { return mRemote; } public ...
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