== tests for reference equality (whether they are the same object). .equals() tests for value equality (whether they are logically "equal"). ... <看更多>

... <看更多>

String Comparison · == This is the main equality operator in Java. · equals. This method is defined by Object class and every class you customly made has it. ... <看更多>

Unlike in C, the problem for Java is that the expression x.equals(y) will throw a NPE when x is null. If you have a String literal "something" and you want ... ... <看更多>

Generally, if the strings contain only ASCII characters, you use the === operator to check if they are equal. · When the strings contain characters that include ... ... <看更多>