How is a class defined in Java?

In Java, to define a class, you need to use the keyword class followed by the name of the class, and the content of the class should be enclosed in a pair of curly braces. Below is an example of defining a simple class:

public class MyClass {
    // 成员变量
    private int myField;
    
    // 构造方法
    public MyClass(int myField) {
        this.myField = myField;
    }
    
    // 方法
    public void myMethod() {
        System.out.println("This is my method.");
    }
}

The example above defines a class named MyClass, which consists of a private integer member variable called myField, a parameterized constructor MyClass, and a method myMethod that does not return a value.