Java Basics Review Notes series five common classes

Java Basic Review Notes series of common classes

1. Introduction of String class.

　　First look at the package that the class belongs to: The Java.lang.String class.

And look at how it's constructed:

2, String s1 = "Hello";

String s2 = "Hello"; conclusion: S1 = = s2.

　　String constants are placed in the data area.

3, String s3 = new String ("Hello");

String S4 = new String ("Hello"); Conclusion: S3! = S4. But S3.equals (S4).

　New is the object that is allocated in the heap interval. But the Equals method is overridden in string.

4. What are the common methods in the string class? (method is understood by literal meaning)

. length ();. IndexOf ();. Equals ();. ValueOf (Object obj) (called the ToString Method); Split ();

5.

Java Basics Review Notes series five common classes