我的代碼不會在循環執行的代碼塊

Question

import java.awt.*; 
import java.awt.geom.Line2D; 
import java.awt.geom.Point2D; 
import java.awt.geom.Rectangle2D; 
import java.applet.Applet; 
import java.util.Scanner; 

public class Histogram extends Applet{ 
static int [] scores= {13,30,23,8}; 
static int [] minInterval = {0,25,50,75}; 
static int [] maxInterval = {25,50,75,100}; 
public void paint (Graphics g){ 
    int max = 0; 
    for (int i = 0; i < scores.length; i++) { 
     if (max < scores[i]) { 
      max = scores[i]; 
     } 
    } 

    Graphics2D g2 = (Graphics2D)g; 
    Point2D.Double Yi = new Point2D.Double(50,50); 
    Point2D.Double Yf = new Point2D.Double(50,30*scores.length); 
    Line2D.Double Y = new Line2D.Double (Yi,Yf); 
    Point2D.Double Xi = new Point2D.Double(50,50); 
    Point2D.Double Xf = new Point2D.Double(50+(8*max),50); 
    Line2D.Double X = new Line2D.Double (Xi,Xf); 
    int x = 8*max; 
    //Draw the "Score" 
    int headerX = 50+(x/(max/5))*((max/5)-1); 
    g2.drawString("Histogram of Student Scores",(headerX),30); 
    for(int i=0;i<=max/5;i++){ 
     int j = (i)*5; 
     if(i<max/5) 
      g2.drawString(String.format("%d",j),50+(x/(max/5))*i,50); 
     else 
      g2.drawString(String.format("Number of Students"),50+(x/(max/5))*i,50); 

    } 
    for(int i=0;i<=maxInterval.length;i++){ 
     if(i != maxInterval.length-1) 
      g2.drawString(String.format("[%d,%d)",minInterval,maxInterval),20,60+(30)*i); 
     else if(i == maxInterval.length-1) 
      g2.drawString(String.format("[%d,%d]",minInterval,maxInterval),20,60+(30)*i); 
     else 
      g2.drawString("Score Ranges",20,60+(30)*i); 
    } 
    g2.draw(X); 
    g2.draw(Y); 
} 

} 

我的問題是代碼當我測試在另一

方法中的循環不進入第三loop.but。它有點工作，所以我不知道接下來要做什麼。我想知道它爲什麼不是

執行該代碼塊。

提前致謝。

Answer 1

您提供了一個數組作爲參數傳遞給String.format("...", ,)（而不是int，您可以通過從陣列中查找元素，推測可能與指數i獲得）。

由於它是String.format的一個參數，所以很可能沒有得到編譯器或IDE警告。

所以，如果你解決這個問題，代碼看起來像這樣，你可以從那裏拿走它。

for (int i = 0; i <= maxInterval.length; i++) { 
     if (i != maxInterval.length - 1) 
      g2.drawString(String.format("[%d,%d]", minInterval[i], maxInterval[i]), 20, 60 + (30) * i); 
     else if (i == maxInterval.length - 1) 
      g2.drawString(String.format("[%d,%d]", minInterval[i], maxInterval[i]), 20, 60 + (30) * i); 
     else 
      g2.drawString("Score Ranges", 20, 60 + (30) * i); 
    }