The meaning of public class in Java: Define a new class, with the first letter of the class name capitalized. Classes can be accessed by classes in the same package or from other packages. Classes consist of data members (fields) and methods.
The meaning of public class in Java
In Java, public class
is Keywords that declare a new class. It has the following meaning:
1. Access permission
-
public
indicates that the class can be accessed by other classes in the same package as well as other packages class access.
2. Class definition
-
class
means defining a new class. - Class names begin with a capital letter to distinguish it from other identifiers.
3. Class structure
- Java classes are composed of data members (fields) and methods.
Example:
public class MyClass { // 数据成员 private String name; // 方法 public void sayHello() { System.out.println("Hello from " + name); } }
In this example:
-
public class MyClass
declares a A new class namedMyClass
, which can be accessed by other classes. -
private String name;
declares a private data member namedname
. -
public void sayHello()
declares a public method namedsayHello
, which outputs a message.
Note:
- Each Java source file can only contain one public class, and its name must be the same as the file name.
-
public class
The keyword must be the first line of the class declaration. - Class names are case-sensitive, so
MyClass
andmyclass
are different classes.
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