Java Can'；在二维数组中找不到项

我试图制作一个程序，用户输入邮政编码的第一部分，3或4个字符（我知道可以是两个字符，但我可以在以后添加），程序通过一个二维数组并输出与之相关的所有值。我认为我在二维数组中获取邮政编码的子字符串的逻辑是合理的（它是由在前面的代码部分中读入的csv文档形成的）。控制台中出现了一系列错误，我不知道出了什么问题。我只是想在这里发布，看看有没有人能帮我。以下是负责执行此过程的方法代码：

public void PostCodeSearch(){
    ReadingFromAFile();
    String StrPstCd = PstCd.getText();
    for (int x = 0; x < twod.length; x++) {
        if (StrPstCd.length() == 3){
            String PstCdSub = twod[x][3].substring(0,2);
            if (StrPstCd.equals(PstCdSub)) {
                text.append("Price = " + twod[x][1] + " " + "Date of Sale: " + twod[x][2] + " " + "Postcode: " + twod[x][3] + "\n");
            }
        }else if(StrPstCd.length() == 4){
            String PstCdSub = twod[x][3].substring(0,3);
            if(StrPstCd.equals(PstCdSub)){
                text.append("Price = " + twod[x][1] + " " + "Date of Sale: " + twod[x][2] + " " + "Postcode: " + twod[x][3] + "\n");
            }// end if
        }

    }// end for
}

public void PostCodeSearch（）{
读取fromafile（）；
字符串StrPstCd=PstCd.getText（）；
对于（int x=0；x

在看不到其余代码的情况下进行最佳猜测。 假设twod是一个二维字符串数组，d0是sale数组索引，d1是虚构的枚举{UNKNOWN，PRICE，DATE，POSTNUMBER}

public void PostCodeSearch() {
    ReadingFromAFile();
    String StrPstCd = PstCd.getText();

    for (int i = 0; i < twod.length; i++) {
        for (int x = 0; x < twod[i][3].length; x++) {

            if (StrPstCd.length == 3  && twod[i][3].length <= x + 3) {
                String PstCdSub = twod[i][3].substring(x, x + 3);
                if (StrPstCd.equals(PstCdSub)) {
                    text.append("Price = " + twod[i][1] + " " + "Date of Sale: " + twod[i][2] + " " + "Postcode: " + twod[i][3] + "\n");
                }
            } 

            else if(StrPstCd.length == 4 && twod[i][3].length <= x + 4) {
                String PstCdSub = twod[i][3].substring(x, x + 4);
                if (StrPstCd.equals(PstCdSub)) {
                    text.append("Price = " + twod[i][1] + " " + "Date of Sale: " + twod[i][2] + " " + "Postcode: " + twod[i][3] + "\n");
                }
            }

        }
    }
}

public void PostCodeSearch（）{
读取fromafile（）；
字符串StrPstCd=PstCd.getText（）；
for（int i=0；iif（StrPstCd.length==3&&twod[i][3].length控制台有什么错误？线程“AWT-EventQueue-0”java.lang.StringIndexOutOfBoundsException:字符串索引超出范围：ExampleGUI的java.lang.String.substring（未知源代码）为3。ExampleGUI的PostCodeSearch（ExampleGUI.java:117）为ExampleGUI.actionPerformed（ExampleGUI.java:76）java.awt.Component.dispatchEventImpl（未知源）java.awt.Component.dispatchEventImpl（未知源）java.awt.Component.dispatchEvent（未知源）java.awt.EventQueue.dispatchEventImpl（未知源）java.awt.EventQueue.dispatchEventImpl（未知源）java.awt.EventQueue.access$200（未知源）java.awt.EventQueue$3.run（未知源）java.awt.EventQueue$3.run（未知源）java.security.AccessController.doPrivileged（本机方法）java.security.ProtectionDomain$1.doIntersectionPrivilege（未知源）java.awt.EventQueue$4.run（未知源）位于java.awt.EventQueue$4.run（未知源）位于java.security.AccessController.doPrivileged（本机方法）位于java.security.ProtectionDomain$1.doIntersectionPrivilege（未知源）位于java.awt.EventQueue.dispatchEvent（未知源）位于java.awt.EventDispatchThread.pumpOneEventForFilters（未知源）java.awt.EventDispatchThread.PumpeEventsForFilter（未知源）java.awt.EventDispatchThread.PumpeEventsForHierarchy（未知源）java.awt.EventDispatchThread.PumpeEvents（未知源）java.awt.EventDispatchThread.run（未知源）java.awt.EventDispatchThread.PumpeEvents（未知源）谢谢，下次编辑初始帖子比在评论中发布更容易。要查看的重要部分是线程“AWT-EventQueue-0”中的
异常java.lang.StringIndexOutOfBoundsException:字符串索引超出范围：3
，它告诉我们它正在尝试访问字符“3”处的字符串，但该字符串没有那么多字符。我现在晚上不在计算机上，所以我将在上午尝试此操作，并让您知道我的进展：）
import static java.util.regex.*;

public void PostCodeSearch() {
    ReadingFromAFile();
    String StrPstCd = PstCd.getText();
    Pattern pattern = Pattern.compile("^\\S*" + StrPstCd + "\\S*$");
    for(int i = 0; i<twod.length; ++i) {
        Matcher matcher = pattern.matcher(twod[i][3]);
        if (matcher.matches()) {
            text.append("Price = " + twod[i][1] + " " + "Date of Sale: " + twod[i][2] + " " + "Postcode: " + twod[i][3] + "\n");
            }
        }
    }