在 Java 中像 C++ 一样创建结构
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Create a Struct In Java Like C++
提问by Arshia Aghaei
i want to create an struct in java , like c++ :
我想在 java 中创建一个结构，比如 c++：
struct MyStruct {
int x;
};
#include <iostream>
int main() {
MyStruct Struct;
Struct.x = 0;
std::cout << Struct.x;
return 0;
}
can anyone help me ?
谁能帮我 ？
回答by manan
You can use a class, which functions similarly to a structin C++.
您可以使用类，其功能类似于structC++ 中的 a。
For example, a C++ pointstruct may look like
例如，一个 C++point结构可能看起来像
typedef struct __point {
int x, y;
} point;
A Java pointclass has the form
Javapoint类具有以下形式
final class Point {
private final double x; // x-coordinate
private final double y; // y-coordinate
// point initialized from parameters
public Point(double x, double y) {
this.x = x;
this.y = y;
}
// accessor methods
public double x() { return x; }
public double y() { return y; }
// return a string representation of this point
public String toString() {
return "(" + x + ", " + y + ")";
}
}
We may then call the following:
然后我们可以调用以下内容：
Point q = new Point(0.5, 0.5);
System.out.println("q = " + q);
System.out.println("x = " + q.x());
回答by manan
public class ircodes {
public ircodes(String msg_id, String node_id, String frequency, String data) {
this.hdr = new msg_hdr(4 + data.length(), Integer.parseInt(msg_id), Integer.parseInt(node_id));
this.frequency = Integer.parseInt(frequency);
this.data = data;
}
public class msg_hdr {
int msg_len;
int msg_id;
int node_id;
public msg_hdr(int msg_len, int msg_id, int node_id) {
this.msg_len = 12 + msg_len;
this.msg_id = msg_id;
this.node_id = node_id;
}
}
msg_hdr hdr;
int frequency;
String data;
public ByteBuffer serialize() {
ByteBuffer buf = ByteBuffer.allocate(hdr.msg_len);
buf.putInt(hdr.msg_len);
buf.putInt(hdr.msg_id);
buf.putInt(hdr.node_id);
buf.putInt(frequency);
buf.put(data.getBytes());
return buf;
}
}
回答by user3437460
Java doesn't have structs like C or C++, but you can use Java classes and treat them like a struct. On top of that, you can of course declare all its members as public. (to work exactly like a struct)
Java 没有structC 或 C++ 之类的 s，但您可以使用 Java 类并将它们视为struct. 最重要的是，您当然可以将其所有成员声明为公共成员。（完全像 a 一样工作struct）
class MyClass
{
public int num;
}
MyClass m = new MyClass();
m.num = 5;
System.out.println(n.num);
One of the differences between a structand a classis that a struct do not have methods. If you create a class without methods, it will work like a struct.
astruct和 a之间的区别class之一是结构没有方法。如果您创建一个没有方法的类，它将像struct.
However, you can always put in methods (getters and setters) and set the variables as private like this (it doesn't hurt).
但是，您始终可以放入方法（getter 和 setter）并将变量设置为私有，就像这样（这不会造成伤害）。
class MyClass
{
private int num;
public void setNum(int num){
this.num = num
}
public int getNum(){
return num
}
}
MyClass m = new MyClass();
m.setNum(5);
System.out.println(n.getNum());
Java doesn't have structs, but a Class can do exactly the same things a structdoes.
Java 没有structs，但 Class 可以做与 a 完全相同的事情struct。
