Written in a class, give a Arraylist array assignment, now judge enter 1 time to modify the subscript 2 elements, but can not change, the set error is how to return a responsibility?

CodePudding user response:

ArrayList type is a test, the set of "dsaf" is a String type,

 public String STR; 

. 

The test m1=new test (); 
M1. STR="dsaf"; 
L.s et (2, m1); 

CodePudding user response:

You directly to collection set a String must not ah, want to take the test first, and then to the second attribute assignment,

CodePudding user response:

Such deposit l.s et (new test (2, "dsaf"));

CodePudding user response:

reference 3 floor yuan dream people reply:

such deposit l.s et (new test (2, "dsaf"));

Ok, thank you!

CodePudding user response:

reference 1/f your 燚 龘 response:

ArrayList type is a test, the set of "dsaf" is a String type,

 public String STR; 

. 

The test m1=new test (); 
M1. STR="dsaf"; 
L.s et (2, m1); 

Ok, thank you!

CodePudding user response:

reference 4 floor weixin_47184967 response:

Quote: reference 3 floor yuan dream people reply:

so save l.s et (new test (2, "dsaf"));

Ok, thank you!

however, so you have to add the full constructor, don't know the constructor did you learn?

CodePudding user response:

reference floor 6 yuan dream people reply:

Quote: refer to 4th floor weixin_47184967 response:

Quote: refer to the third floor yuan dream people reply:

this deposit l.s et (new test (2, "dsaf"));

Ok, thank you!

however, so you have to add the full constructor, don't know the constructor did you learn?

Haven't learn yet

CodePudding user response:

reference floor 6 yuan dream people reply:

Quote: refer to 4th floor weixin_47184967 response:

Quote: refer to the third floor yuan dream people reply:

this deposit l.s et (new test (2, "dsaf"));

Ok, thank you!

however, so you have to add the full constructor, don't know the constructor did you learn?

Constructor how ah?

CodePudding user response:

The public test (int num, String STR) {
This. Num=num;
Enclosing the STR=STR;
}

CodePudding user response:

You specify what type, save is corresponding to the type