java中非法的表达式开始什么意思_Java错误：表达式的非法开头

最新推荐文章于 2023-11-13 16:00:05 发布

健康和谐男哥

最新推荐文章于 2023-11-13 16:00:05 发布

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文章标签： java中非法的表达式开始什么意思

本文链接：https://blog.youkuaiyun.com/weixin_36059856/article/details/114843452

本文探讨了Java中局部变量的定义与使用限制，解释了为何局部变量不能声明为public等访问级别。同时深入介绍了static关键字的作用，包括如何在类中声明静态成员，并通过实例演示了静态成员和实例成员的区别。

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小编典典

方法只能声明局部变量。这就是为什么当您尝试将其声明为public时，编译器会报告错误的原因。

对于局部变量，您不能使用任何类型的访问器(公共，受保护或私有)。

您还应该知道static关键字的含义。在方法中checkYourself，您使用Integer数组locations。

static关键字区分对象创建可访问的元素。因此，它们不是对象本身的一部分。

public class Test { //Capitalized name for classes are used in Java

private final init[] locations; //key final mean that, is must be assigned before object is constructed and can not be changed later.

public Test(int[] locations) {

this.locations = locations;//To access to class member, when method argument has the same name use `this` key word.

}

public boolean checkYourSelf(int value) { //This method is accessed only from a object.

for(int location : locations) {

if(location == value) {

return true; //When you use key word return insied of loop you exit from it. In this case you exit also from whole method.

}

return false; //Method should be simple and perform one task. So you can get more flexibility.

}

public static int[] locations = {1,2,3};//This is static array that is not part of object, but can be used in it.

public static void main(String[] args) { //This is declaration of public method that is not part of create object. It can be accessed from every place.

Test test = new Test(Test.locations); //We declare variable test, and create new instance (object) of class Test.

String result;

if(test.checkYourSelf(2)) {//We moved outside the string

result = "Hurray";

} else {

result = "Try again"

}

System.out.println(result); //We have only one place where write is done. Easy to change in future.

}

2020-09-16