（處理）當我嘗試運行此代碼時，我得到一個空指針異常

Question

該程序在屏幕上隨機創建10個方塊，然後10個點，然後使用for循環來比較每個方塊與每個方塊來決定是否該點在正方形內，但每當我運行此代碼，此行

points[i].x > squares1[j].x && points[i].x < squares2[j].x && points[i].y > squares1[j].y && points[i].y < squares2[j].y 

返回一個空指針異常，我不能爲我的生命找出原因，任何人都可以請幫助。

主代碼

PVector[] points; 
    PVector[] squares1; 
    PVector[] squares2; 

    void setup() 
    { 
     size(800, 800); 
     points = new PVector[10]; 
     squares1 = new PVector[10]; 
     squares2 = new PVector[10]; 
     for(int i = 0; i < 10; i+= 80) 
     { 
     squares1[i] = new PVector(random(0, width-80), i); 
     squares2[i] = new PVector(squares1[i].x+80, squares1[i].y+80); 
     rect(squares1[i].x, squares1[i].y, 80, 80); 
     } 
     for(int i = 0; i < points.length; i++) 
     { 
     points[i] = new PVector(random(width), random(height)); 
     for(int j = 0; j < 10; j++) 
     { 
      if(points[i].x > squares1[j].x && points[i].x < squares2[j].x && points[i].y > squares1[j].y && points[i].y < squares2[j].y) 
      { 
      fill(255, 0, 0); 
      ellipse(points[i].x, points[i].y, 5, 5); 
      println("Point " + i+1 + " is contained in figure " + j + "."); 
      } 
      else 
      { 
      fill(0); 
      ellipse(points[i].x, points[i].y, 5, 5); 
      println("Point " + i+1 + " is not contained in any figure."); 
      } 
     } 
     } 
    } 

    void draw() 
    { 

    } 

Answer 1

替換I + = 80，其中i ++;所以只有第一個squares1 [0]和square2 [0]被初始化。所以你得到一個空指針異常