What does public class mean in java

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:

<code class="java">public class MyClass {

    // 数据成员
    private String name;

    // 方法
    public void sayHello() {
        System.out.println("Hello from " + name);
    }
}</code>

In this example:

• public class MyClass declares a A new class named MyClass, which can be accessed by other classes.
• private String name; declares a private data member named name.
• public void sayHello() declares a public method named sayHello, 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 classThe keyword must be the first line of the class declaration.
• Class names are case-sensitive, so MyClass and myclass are different classes.

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