Invoking Java Structures: A Comprehensive Guide to Methods and Best Practices

In Java, there is no separate concept of structures. Instead, structures are represented through classes. Therefore, to use the functionality of structures, you can create a class instead.

In Java, ways to call a struct involves:

1. Create a class to represent a data structure, with member variables and methods.
2. Instantiate objects of a class, and access instance variables and methods through the objects.
3. Constructors can be used to initialize the state of an object.
4. It is possible to define methods in a class to manipulate the member variables of a data structure.

The sample code is as follows:

public class MyStruct {
    private int data1;
    private String data2;
    
    public MyStruct(int data1, String data2) {
        this.data1 = data1;
        this.data2 = data2;
    }
    
    public int getData1() {
        return this.data1;
    }
    
    public String getData2() {
        return this.data2;
    }
    
    public void setData1(int data1) {
        this.data1 = data1;
    }
    
    public void setData2(String data2) {
        this.data2 = data2;
    }
    
    public void printData() {
        System.out.println("Data1: " + this.data1);
        System.out.println("Data2: " + this.data2);
    }
}

public class Main {
    public static void main(String[] args) {
        MyStruct myStruct = new MyStruct(10, "Hello");
        
        System.out.println("Data1: " + myStruct.getData1());
        System.out.println("Data2: " + myStruct.getData2());
        
        myStruct.setData1(20);
        myStruct.setData2("World");
        
        myStruct.printData();
    }
}

In the example above, a MyStruct class is defined to represent a structure, which includes two member variables, data1 and data2, and provides corresponding methods to access and manipulate these member variables. In the Main class, a MyStruct object is instantiated and the appropriate methods are called to operate on and output the data.