What is the name of the method used to start thread execution?
时间: 2024-05-17 08:18:08 浏览: 98
The `start()` method is used to start the execution of a thread in Java. When this method is called on a `Thread` object, it creates a new thread and calls the `run()` method on it, which starts the execution of the thread.
相关问题
what is the difference of "+" symbol and "force" command in makefile?
In a Makefile, the "+" symbol and the "force" command have different meanings.
The "+" symbol is used to indicate that a command must be executed, even if the "-n" or "--just-print" option is used. This is called a forced execution. For example:
```
target:
+echo "This command will always be executed"
```
If you run `make target`, you will see the output "This command will always be executed", even if you use the "-n" option.
The "force" command, on the other hand, is used to force a rule to be executed, even if its dependencies are up to date. For example:
```
.PHONY: target
target:
force
echo "This command will always be executed"
```
If you run `make target`, the "force" command will cause the following command to be executed, even if the dependencies of the rule are up to date.
Note that the "force" command is not a built-in command in Makefile. It is a target name that is defined as a phony target, which means that it doesn't correspond to an actual file.
Explain what the keyword this is used for in JavaScript。
In JavaScript, the keyword this is used to refer to the current execution context, which is usually the object that a function is a method of. The value of this depends on how a function gets called or executed.
When a function is called with the dot notation, this refers to the object that the function is a method of. For example, in the following code, this inside the function foo refers to the object obj:
```
var obj = {
prop: 'Hello',
foo: function() {
console.log(this.prop);
}
};
obj.foo(); // logs 'Hello'
```
When a function is called without a context or with the global context, this refers to the global object (in the browser, this is usually the window object). For example:
```
function bar() {
console.log(this);
}
bar(); // logs the global object (e.g. window in the browser)
```
The value of this can also be explicitly set using the call, apply, or bind methods of a function.
In general, using the keyword this allows functions to be more flexible and reusable, because they can work with different objects and contexts.