final

Is there a solution to use a final variable in a Java constructor? The problem is that if I initialize a final field like: private final String name = "a name"; then I cannot use it in the constructor. Java first runs the constructor and then the fields. Is there a solution that allows me to access the final field in the constructor? I do not really understand your question. That public class Test3 { private final String test = "test123"; public Test3() { System.out.println("Test = "+test); } public static void main(String[] args) { Test3 t = new Test3(); } } executes as follows: $ javac Test3

final关键字特点 final修饰类：final修饰的类不能被继承 final修饰变量：final修饰的变量不能被二次修改，也称为常量 final修饰方法：final修饰的方法不能被重写 来源： https://blog.csdn.net/dreamchaser1997/article/details/99678250

I am facing a use case where I would like to declare a static final field with an initializer statement that is declared to throw a checked exception. Typically, it'd look like this: public static final ObjectName OBJECT_NAME = new ObjectName("foo:type=bar"); The issue I have here is that the ObjectName constructor may throw various checked exceptions, which I don't care about (because I'd know my name is valid, and it's allright if it miserably crashes in case it's not). The java compiler won't let me just ignore this (as it's a checked exception), and I would prefer not to resort to: public

public class A { private static final int x; public A() { x = 5; } } final means the variable can only be assigned once (in the constructor). static means it's a class instance. I can't see why this is prohibited. Where do those keywords interfere with each other? A constructor will be called each time an instance of the class is created. Thus, the above code means that the value of x will be re-initialized each time an instance is created. But because the variable is declared final (and static), you can only do this class A { private static final int x; static { x = 5; } } But, if you remove