Difference between String == and equals()

What is the difference between "==" and equals();?

Difference between concrete and abstract method

What is concrete method and abstarct method?

In java String can be Created by two ways 1.String str="krishna"; 2.String str=new String("krishna"); Can any one List out the Difference??

In java String can be Created by two ways
1.String str="krishna";
2.String str=new String("krishna");
Can any one List out the Difference??

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