java 包装类型是类吗?

public class Test {

 public static void main(String[] args) {

  System.out.println("return is :" + test1().getClass());
 }

 public static Integer test1() {
  int i = 10;
  return i;
 }

}

运行结果:return is :class java.lang.Integer

 

感觉返回的i是个引用还是值???????????????

 

public class Test {

 public static void main(String[] args) {

  System.out.println("return is :" + test1());
 }

 public static int test1() {
  int i = 10;
  try {
   return i;
  } catch (Exception e) {
   return 0;
  } finally {
   i = 20;
  }
 }
}
运行结果:return is :10
这里涉及return问题

 

public class Test {

 public static void main(String[] args) {

  System.out.println("return is :" + test1());
 }

 public static Integer test1() {
  Integer i = new Integer(10);
  try {

   return i;

  } catch (Exception e) {
   return i;
  } finally {
   i = new Integer(20);
  }
 }

}

运行结果:return is :10

return到底是引用还是基本值哈?

 

本环境是JDK5.0

如果是JDK1.4会怎么样哈?

 

大家研究哈??