Java中final变量使用总结

import static java.lang.System.out; 
import java.util.Random; 
class Test{ 
  int i = 0; 
} 
public class FinalData { 
  static Random rand = new Random(); 
  private final int VALUE_1 = 9;//final定义的变量必须使用大写字母命名 
  private static final int VALUE_2 = 10;//并且使用下划线进行连接； 
  private final Test test = new Test(); 
  private Test test2 = new Test(); 
  private final int[] a = {1,2,3,4,5,6}; 
  private final int i4 = rand.nextInt(20); 
  private static final int i5 = rand.nextInt(20); 
  public String toString() 
  { 
    return i4 + "" + i5 + ""; 
  } 
  public static void main(String[] args) { 
    FinalData data = new FinalData(); 
    //data.test = new Test(); 
    //data.VALUE_2++; 
    data.test2 = new Test(); 
    for(int i=0; i<data.a.length; i++) 
    { 
      //a[i] = 9; 
    } 
    out.println(data); 
    out.println("data2"); 
    out.println(new FinalData()); 
    out.println(data); 
  } 
} 

import static java.lang.System.out; 
import java.util.Random; 
public class FinalStaticData { 
  private static Random rand = new Random(); 
  private final int a1 = rand.nextInt(10); 
  private static final int a2 = rand.nextInt(10); 
   
  public static void main(String[] args) { 
    FinalStaticData fdata = new FinalStaticData();//实例化一个对象 
    out.println("重新实例化对象调用a1的值:" + fdata.a1); 
    out.println("重新实例化对象调用a2的值:" + fdata.a2);   
    FinalStaticData fdata2 = new FinalStaticData();// 实例化新对象 
    out.println("重新实例化对象调用a1的值:" + fdata2.a1); 
    out.println("重新实例化对象调用a2的值:" + fdata2.a2); 
  } 
}