String s = new string ("XYZ") how many string objects are created?

One or two . If the string constant pool already has “xyz”, It is a ; otherwise , Two .

When the character creation constant pool does not “xyz”, The following two objects will be created ：

One is the literal amount of a string "xyz" The corresponding 、 Resident （intern） Instances in a globally shared string constant pool , At this time, the instance is also in the heap , String constant pool only puts references .

The other is through new String() Create and initialize , Content and "xyz" Same instance , It's also in the heap .

String s = "xyz" and String s = new String("xyz") difference ？

Both statements will first go to the string constant pool to check whether it already exists “xyz”, If so, use , If not, the... Is created in the constant pool “xyz” object .

in addition ,String s = new String("xyz") Will pass new String() Create a content and in the heap "xyz" Same object instance .

So the former is actually understood as being included by the latter .