java 更改最终整数变量的值
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Change the value of final Integer variable
提问by Majid Laissi
A finalobject cannot be changed, but we can set its attributes:
一个final对象不能改变，但我们可以设置它的属性：
final MyClass object = new MyClass();
object.setAttr("something"); //<-- OK
object = someOtherObject; //<-- NOT OK
Is it possible to do the same with a final Integerand change its intvalue?
是否可以对 a 执行相同的操作final Integer并更改其int值？
I'm asking because I call a worker:
我问是因为我打电话给工人：
public SomeClass myFunction(final String val1, final Integer myInt) {
session.doWork(new Work() {
@Override
public void execute(...) {
//Use and change value of myInt here
//Using it requires it to be declared final (same reference)
}
}
And i need to set the value of myIntinside of it.
我需要设置myInt它内部的值。
I can declare my intinside another class, and that would work. But I wonder if this is necessary.
我可以int在另一个类中声明我的内部，这会起作用。但我想知道这是否有必要。
回答by Denys Séguret
No : an Integeris immutable, just like for example String.
不： anInteger是不可变的，就像 example 一样String。
But you can design your own class to embed an integer and use it instead of an Integer :
但是您可以设计自己的类来嵌入整数并使用它代替 Integer ：
public class MutableInteger {
private int value;
public MutableInteger(int value) {
this.value = value;
}
public int getValue() {
return value;
}
public void setValue(int value) {
this.value = value;
}
}
回答by Peter Lawrey
You can't because it immutable by design.
你不能，因为它在设计上是不可变的。
You can set the value of an int[]or Integer[]or AtomicInteger
您可以设置的值int[]或Integer[]或AtomicInteger
回答by Rohit Jain
You cannot change the value of finalinteger once assigned.. However, you can delay the assignment., i.e. : - You can only assign a finalinteger once.. You can do it either at the time of declaration, or in initializer block, or in constructor..
您不能更改final分配后的整数值.. 但是，您可以延迟分配。，即： - 您只能分配一次final整数.. 您可以在声明时，或在初始化程序块中，或在构造器..
回答by Stijn Geukens
You could wrap your Integer in another object that is final and then 'replace' the Integer inside that wrapper object by another.
您可以将 Integer 包装在另一个最终对象中，然后用另一个对象“替换”该包装对象中的 Integer。
