爱立信笔试

1.

public class Test7 {
      public void get(double d){
    	  System.out.println("double");
      }
      
      public void get(Double d){
    	  System.out.println("Double");
      }
      public static void main(String args []){
    	  Test7 test=new Test7();
    	  test.get(7.0);
    	  test.get(7.0*5);
    	  Double d=new Double(7);
    	  test.get(d);
    	  test.get(d*d);
    	  test.get(d*5);
      }
}

 double

double

Double

double

double

封装类型和非封装类型相乘会变成非封装类型，和封装类型的乘积也会变成基本类型