我會如何去做這樣的事情在Java中？

Question

typedef struct 
{ 
    float lifetime;      // total lifetime of the particle 
    float decay;       // decay speed of the particle 
    float r,g,b;       // color values of the particle 
    float xpos,ypos,zpos;     // position of the particle 
    float xspeed,yspeed,zspeed;   // speed of the particle 
    boolean active;      // is particle active or not? 
} PARTICLE; 

    void CreateParticle(int i) 
    { 
     particle[i].lifetime= (float)random(500000)/500000.0; 
     particle[i].decay=0.001; 
     particle[i].r = 0.7; 
     particle[i].g = 0.7; 
     particle[i].b = 1.0; 
     particle[i].xpos= 0.0; 
     particle[i].ypos= 0.0; 
     particle[i].zpos= 0.0; 
     particle[i].xspeed = 0.0005-(float)random(100)/100000.0; 
     particle[i].yspeed = 0.01-(float)random(100)/100000.0; 
     particle[i].zspeed = 0.0005-(float)random(100)/100000.0; 
     particle[i].active = true; 
    } 

我會如何去在Java中做這樣的事情？我認爲這看起來像是一個很好的方式，我希望Java中有類似的解決方案。

Answer 1

您可以創建一個Particle類：

import java.util.Random; 

public class Particle { 
    // Data fields: 
    private double lifetime; 
    private double decay; 
    private double r, g, b; 
    private double xpos, ypos, zpos; 
    private double xspeed, yspeed, zspeed; 
    private boolean active; 

    // Constructor 
    public Particle() { 
     r = 0.7; g = 0.7; b = 1.0; 
     decay = 0.001; 
     Random rand = new Random(); 
     lifetime = rand.nextInt(500000)/500000.0; 
     xspeed = 0.0005 - rand.nextInt(100)/100000.0; 
     yspeed = 0.01 - rand.nextInt(100)/100000.0; 
     zspeed = 0.0005 - rand.nextInt(100)/100000.0; 
     active = true; 
     // all others are 0 by default 
    } 
} 

您也可以輕鬆地方法來回報您的數據字段的值，例如：

public double lifetime() { 
    return lifetime; 
}