主线程出错

Question

我想知道是否有人能找出我收到错误的原因 Exception in thread "main" java.lang.NullPointerException at WordSorter.verifier(WordSorter.java:76) at WordSorter.main(WordSorter.java:12) 我做了这个程序：

    import java.util.Scanner;
public class WordSorter {
    static String words[];
    static String sameEnd[][];
    static String sameBeg[][];
    static String alph[]={"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"};

public static void main (String args[]){
    Scanner getWordInput = new Scanner(System.in);
    System.out.println("Enter word");
    verifier(getWordInput.next());
    System.out.println("Thank you.\nWhat would you like to do next?\n1:View list of entered words so far\n2: View list of words that start with the same letter\n3: View list of words ending with the same letter");
    Scanner getFunctionInput = new Scanner(System.in);
    int inputNum = getFunctionInput.nextInt();
    switch (inputNum){
        case 1:
            viewListTot();
            break;
        case 2:
            viewListSameBeg();
            break;
        case 3:
            viewListSameEnd();
        default:
            System.out.println("Sorry, we're not sure what command you attempted to run");
            break;
    }
}

public static void inputSameEnd(String x){
    int i=0;
    while(i<26){
        if(x.endsWith(alph[i])){
            sameEnd[i][sameEnd.length+1]=x;
        }
        i++;
    }
}

public static void inputSameBeg(String x){
    int i=0;
    while(i<26){
        if(x.startsWith(alph[i])){
            sameBeg[i][sameBeg.length+1]=x;
        }
        i++;
    }
}

public static void viewListTot(){
    for(int x=0;x<=words.length;x++){
        System.out.println(words[x]);
    }
}

public static void viewListSameBeg(){
    for(int row = 0; row<=sameBeg.length; row++){
        for(int column = 0; column<=sameBeg[row].length; column++){
            System.out.println(sameBeg[row][column]);
        }
    }
}

public static void viewListSameEnd(){
    for(int row = 0; row<=sameEnd.length; row++){
        for(int column = 0; column<=sameEnd[row].length; column++){
            System.out.println(sameEnd[row][column]);
        }
    }
}

public static void verifier(String w){
    int i=0;
    boolean WordThere = false;
    while(i<=words.length){
        if(words[i].equals(w)){
            System.out.println(w+" is already in the dictionary");
            WordThere=true;
        }
        if(i==words.length&&WordThere==false){
            words[i].equals(w);
            inputSameEnd(w);
            inputSameBeg(w);
        }
        i++;
    }
}

}

我试图将变量动态更改为所有正常而不是静态，因为我尝试多次访问单词数组而没有出现错误，但我还没有提出足够好的解决方案。我认为这可能是一个多线程问题，但后来我认为我一次不会处理多个任务。 我觉得晚安的休息对我有好处，因为我几乎从早上6点到晚上9点40分在电脑里一整天都在用C＃和python编程其他东西。 我希望有一个人可以帮助我！ 谢谢， - 最大