final

Access variable from inner class without making it final

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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; String di9 = null; String di10 = null; String di11 = null; String mi1 = null; String mi2 = null; String

what is the use of keyword final?

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问题 In the below code if i remove the keyword final from EditText i am an getting error in the line (6) where i pass EditText object (et) to the intent...I have to knw the significance of final keyword here... final EditText et=(EditText)findViewById(R.id.t); Button b=(Button)findViewById(R.id.b1); b.setOnClickListener(new Button.OnClickListener(){ public void onClick(View v)<br> { Intent on=new Intent(Intent.ACTION_CALL,Uri.parse("tel:"+et.getText())); startActivity(on); } }); 回答1: It is because

Java Applet - Cannot inherit from final class

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We have a java applet which is working OK in most client environments, primarily Windows 7, but recently we have been asked to support Ubuntu clients as well. The problem is that when the applet is fired up on the Ubuntu client (running Firefox and the natively installed "IcedTEA" Java VM 1.7.0_75) we get this exception: java.lang.VerifyError: Cannot inherit from final class at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:800) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader

Is there any functional difference between c# sealed and Java's final keyword? [duplicate]

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问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: What is the equivalent of Java’s final in C#? In Java final applies to more than just a class. So, I wonder: is there any functional difference between the two keywords? Thank you, and sorry for a relatively noob question. A quick Google search did not satisfy my needs. 回答1: Java's final keyword is the equivalent of C#'s sealed , readonly , and sealed keywords. Two of those three are somewhat different in Java

Any nice way to make two immutable objects refer to eachother?

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问题 Take these two Java classes: class User { final Inventory inventory; User (Inventory inv) { inventory = inv; } } class Inventory { final User owner; Inventory (User own) { owner = own; } } Is there any way without using reflection* to pull this off? I don't actually expect it is, but it can't hurt to ask. Update: Since in bytecode construction has two steps (1. allocate object, 2. call constructor**) could this be (ab)used to do this, with handwritten bytecode or a custom compiler? I'm

Partial constructed objects in the Java Memory Model

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I came across the following code in an article somewhere on the Internet : public class MyInt { private int x; public MyInt(int y) { this.x = y; } public int getValue() { return this.x; } } The article states that Constructors are not treated special by the compiler (JIT, CPU etc) so it is allowed to reorder instructions from the constructor and instructions that come after the constructor. Also, this JSR-133 article about the Java Memory Model states that A thread that can only see a reference to an object after that object has been completely initialized is guaranteed to see the correctly

局部内部类的final问题

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局部内部类，如果希望访问所在方法的局部变量，那么这个局部变量就必须是final的（或者只赋值一次）从Java8开始，只要局部变量事实不变那么final关键字可以省略为什么需要保证变量为final，因为与生命周期有关，只有不变才能谈到复制在类内部； 1new出来的对象在堆内存当中； 2局部变量是跟这方法走的，在栈内存当中 3方法运行结束之后立刻出栈，局部变量就会立刻消失 4但是new出来的对象会在堆当中持续存在，直到垃圾回收消失；来源： https://www.cnblogs.com/Damocless/p/11869838.html

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final 可以用来修饰的结构：类方法变量 final用来修饰一个类：此类不能被其他类所继承　　String System StringBuffer 修饰方法：　　不能被重写 final用来修饰变量：此时变量就称为是一个常量可以考虑赋值的位置：显示初始化代码块中初始化构造器中初始化　　来源： https://www.cnblogs.com/ergePython/p/11869446.html

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

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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 thread, you still typically need to use synchronization. There is no other way to ensure, for example,

Variable used in lambda expression should be final or effectively final

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编译器报错： Variable used in lambda expression should be final or effectively final 我这边本来思想是这样的，想遍历，如果出现了c，那么就将外部变量修改为true，但是并不能实现原因： lambda表达式是一个函数式接口，接口中可以定义变量，那么这个变量是final修饰的，所以需要传入final的来源： https://www.cnblogs.com/xiufengchen/p/11863549.html