public final int MAX_ARRAY_SIZE = 25; 例 final 关键字程序:Test.java public final class Test{ public static final int TOTAL_ NUMBER= 5 ; public int id; public Test(){ id = ++ TOTAL_ NUMBER;//非法,对final变量TOTAL_ NUMBER进行二次赋值了。 //因为++TOTAL_ NUMBER相当于 :TOTAL_NUMBER=TOTAL_NUMBER+1 } public static void main(String[] args) { final Test t = new Test(); final int i= 10; final int j; j = 20; j = 30; //非法,对final变量进行二次赋值 } }//源代码片段来自云代码http://yuncode.net