final

Garbage collection when final variables used in anonymous classes

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问题 If I have code similar to the following: public Constructor(final Object o) { taskSystem.add(new CycleTask(15, 15, -1) { @Override public void execute() throws Throwable { //access o here every 15 cycles forever } }); } When would o be garbage collected, if ever? Only when the task has been collected, or will it remain in memory forever because it's final? 回答1: o might get garbage collected once it is not reachable any longer, whether it is final or not. Obviously, as long as execute is

Access variable from inner class without making it final

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问题 how could i get this to work: public void onStart() { super.onStart(); int dayN = 0; int i = 0; String day = null; String addFach; String mo1 = null; String mo2 = null; String mo3 = null; String mo4 = null; String mo5 = null; String mo6 = null; String mo7 = null; String mo8 = null; String mo9 = null; String mo10 = null; String mo11 = null; String di1 = null; String di2 = null; String di3 = null; String di4 = null; String di5 = null; String di6 = null; String di7 = null; String di8 = null;

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final：最终的 1、修饰类：不能被继承 2、修饰方法：不能被重写 3、修饰变量：值不能修改，即常量来源： https://www.cnblogs.com/daidai66/p/11992928.html

Local variables referred from inner class must be final or effectively final

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问题 Please have a look at the below code private void displayInitialRevenue_Method() { //Get the dates from the combo String selectedCouple = revenueYearCombo.getSelectedItem().toString(); if (selectedCouple.equals("Select Year")) { return; } String[] split = selectedCouple.split("/"); //Related to DB double totalAmount = 0.0; //Get data from the database dbConnector = new DBHandler(); dbConnector.makeConnection(); DefaultTableModel model = (DefaultTableModel) initialRevenueTable.getModel();

use mockito to stub final method [duplicate]

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This question already has answers here : Final method mocking (7 answers) Closed 5 years ago . I need to use a mock who has a final method. So i use powermock but it does not work class B { public final int nb() { return 4; } } @RunWith(PowerMockRunner.class) @PrepareForTest(B.class) public class Exemple extends TestCase { @Test public void test() { B b = PowerMockito.mock(B.class); PowerMockito.when(b.nb()).thenReturn(5); final int actualState = b.nb(); assertEquals(5, actualState); } } if someone has a solution, thank you in advance Your example is fine, should work without any problem.

ABAP学习（14）：ABAP面向对象

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ABAP面向对象 1、类的定义与实现类定义：语法：Class <类名> definition. Public section. Methods:<方法名> Importing <参数名> type <参数类型> Exporting <参数名> type <参数类型>. Endclass. 类实现：语法：Class <类名> implementation. Public section. Method <方法名>. 实现具体代码块. Endmethod. Endclass. 2、抽象类抽象类定义，抽象方法定义，使用Abstract关键字。示例： "抽象类定义 "抽象类可以包含静态成员 class-data ,class-methods,class-events "抽象类可以包含非抽象方法 "抽象类可以不定义任何方法 "抽象类不可以create object 创建实例,但是可以用create object type ref to 创建抽象类引用,并接受子类实例 CLASS base_class DEFINITION ABSTRACT. "抽象类关键子abstract,基类 PUBLIC SECTION. METHODS:message ABSTRACT "抽象方法 IMPORTING msg TYPE String OPTIONAL. METHODS:sayHello

Synchronize to ensure that reference to immutable object will be seen by another thread

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问题 I was studying this to understand the behavior of final fields in the new JMM (5 onwards). This concept is clear: guaranteed visibility of initialized final fields to all threads after the object is properly constructed. But then at the end of the section, I read this, which simply confuses me: Now, having said all of this, if, after a thread constructs an immutable object (that is, an object that only contains final fields), you want to ensure that it is seen correctly by all of the other

final修饰符

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final修饰类，方法，属性分别有不同的意思修饰类表示该类不可继承修饰方法表示该方法不可被重写修饰基本类型变量，该变量值不可修改。修饰引用则该引用只有一次指向对象的机会，不能再指向其他对象。来源： https://www.cnblogs.com/licheee/p/11969879.html

Handling of `final` by the JVM

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In a comment to this question , I'm claiming that final in some cases must be honored by the JVM. The safe publication of final variables has been already asked and so was the handling of static final members . But what about enforcing classes and methods being final and forbidding overwriting of final fields? IMHO this can and must be done at class loading time. My argument is that For the security of the JVM is crucial that e.g. String is final , so a hand-crafted class extending it must not be loaded. Similarly for public final fields. While reflection can change them, it's checked at

final 修饰符

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final 修饰符：不可改变的它可以修饰非抽象类、非抽象方法和变量 1.修饰类：不能被继承没有子类 2.final修饰方法：该方法不能被覆盖 final getClass();//获得对象本质类型 3.final修饰变量：该变量是常量，【只能赋一次值】，必须要赋初始值。非静态final成员变量: 赋值: 1,声明的同时赋值 2,可以在匿名代码块中赋值 3,可以在构造器中赋值静态的final成员变量: 1,声明的同时赋值 2,可以在静态代码块中赋值【String类不能被继承因为String类有final修饰】 4final变量的赋值 4.1:final修饰非静态成员变量,必须要赋值,并且只能在下面三个地方赋值,赋值以后不能改。 4.1.1:声明的同时赋值 4.1.2:匿名代码块内赋值 4.1.3:类中任何构造器赋值 4.2:final修饰static静态的成员变量 4.2.1:声明的同时赋值 .4.2.2:static代码块内赋值 4.3:final修饰变量结论 4.3.1: final可以修饰任何变量. 4.3.1: final修饰的变量必须赋初始值 4.3.3: final修饰的变量被一次赋值以后不能跟改来源： https://www.cnblogs.com/yxj808/p/11964852.html