Variable textbook series (seven) - Java in the final modification of variables
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final modification of a variable, there are a lot of stories, such as can not be changed, and so
accurate description is that when a final variable is modified, the opportunity for the variable assignment only once
Step 1: When an assignment statement
Step 2: When in a statement no assignment
step 3: final modification other
Example 1: When the assignment statement
i in the 4th line has already been assigned, so here compilation error occurs
public class HelloWorld {
public void method1() {
final int i = 5;
i = 10; //i在第4行已经被赋值过了，所以这里会出现编译错误
}
}
Example 2: When there is no assignment statement
if the statement when unassigned, you can assign a unique code behind
public class HelloWorld {
public void method1() {
final int i;
i = 10; //i在第4行，只是被声明，但是没有被赋值，所以在这里可以进行第一次赋值
i = 11; //i在第6行已经被赋值过了，所以这里会出现编译错误
}
}
Example 3: final modify other
final addition to modification of variables, classes can also be modified, modification methods, which are deployed in the subsequent chapters
