instance variable在对象被创建时初始化，假如有5个对象，那5个对象中该instance variable可以有不同的值。static variable在类被第一次加载到jvm中时初始化，像c中的global variable，被所有instance共享，因此在multi-thread编程时要特别注意线程安全问题。
instance variable：实例变量，即类型的成员变量，且是非静态(即非static)的。local variable：局部变量，即在类型的成员方法体内定义的变量。class A{int a;//实例变量void B(){int b;//局部变量}}
The default value for instance variables in Objective-C is 0. Local variables take precedence over the instance variable and effectively hides it.
make _local an instance variable f3e8750 sebastiandev approved these changes Dec 17, 2020 View reviewed changes sebastiandev merged commit 60519ae into master Dec 30, 2020 Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment Reviewers sebastian...
The local variables section contains a method's parameters and local variables. Compilers place the parameters into the local variable array first, in the order in which they are declared. Figure 5-9 shows the local variables section for the following two methods: ...
and char, however, are supported directly by the Java Virtual Machine. These can be stored on the heap as instance variables or array elements, or in the method area as class variables. When placed into local variables or the operand stack, however, values of type byte, short, and char ...
Each thread holds an implicit reference to its copy of a thread-local variable as long as the thread is alive and the ThreadLocal instance is accessible; after a thread goes away, all of its copies of thread-local instances are subject to garbage collection (unless other references to these...
ThreadLocal<T>() Initializes the ThreadLocal<T> instance. ThreadLocal<T>(Boolean) Initializes the ThreadLocal<T> instance and specifies whether all values are accessible from any thread. ThreadLocal<T>(Func<T>, Boolean) Initializes the ThreadLocal<T> instance with the specified valueFactory...
LocalVariableInfo Class Reference Feedback Definition Namespace: System.Reflection Assemblies: netstandard.dll, System.Runtime.dll Source: LocalVariableInfo.cs Discovers the attributes of a local variable and provides access to local variable metadata. C# Copy public class LocalVariableInfo ...
(); * } * } * * Each thread holds an implicit reference to its copy of a thread-local * variable as long as the thread is alive and the {@code ThreadLocal} * instance is accessible; after a thread goes away, all of its copies of * thread-local instances are subject to garbage...