Java与Go语言差异1 传值还是传引用

public class Test {

    static class Vertex{
        public double x;
        public double y;
    }

    static double abs(Vertex v) {
        return Math.sqrt(v.x * v.x + v.y * v.y);
    }

    static void scale(Vertex v, double f) {
        v.x = v.x * f;
        v.y = v.y * f;
    }

    public static void main(String[] args) {
        Vertex vertex = new Vertex();
        vertex.x = 3;
        vertex.y = 4;
        System.out.println(abs(vertex)); // 5

        scale(vertex, 10);
        System.out.println(abs(vertex)); // 50
    }
}

package main

import (
	"fmt"
	"math"
)

type Vertex struct {
	X, Y float64
}

func (v Vertex) Abs() float64 {
	return math.Sqrt(v.X*v.X + v.Y*v.Y)
}

func (v *Vertex) Scale(f float64) {
	v.X = v.X * f
	v.Y = v.Y * f
}

func main() {
	v := Vertex{3, 4}
	v.Scale(10)
	fmt.Println(v.Abs()) // 50
}