[英]How do I count words from a file or string object using a nested for loop?
這是一個項目,大部分已經完成,但是我需要能夠計算一個字符串或文件中的單詞數量。 我必須使用嵌套的for循環,並且必須使用包含單詞的定界符的String。 現在,這就是我所擁有的:
public static int wordCounter(String text)
{
String WORDS_GROUP = ",\n ";
String text= "This is my sample text";
int wordCount=0;
for(int i=0; i<text.length(); i++){
for(int j=0; j<WORDS_GROUP.length(); j++){
if(text.charAt(i)==WORDS_GROUP.charAt(j)){
wordCount++;
}
}
}
}
如果您絕對需要使用嵌套的for循環,則可以讓第一個for循環遍歷文本中的所有行,第二個(嵌套)for循環遍歷每行的所有單詞,然后簡單地對它們進行計數。
你已經增加wordCount
只有當最后一個字符不屬於WORDS_GROUP
否則你最終有更多的話比你確實有。 例如,當您在sample
后找到第一個空格時, wordCount
為3,但隨后又出現另一個空格,您的算法將再次增加,這顯然是不正確的。
您可以引入一個新的boolean
變量,如果找到第一個帶空格並執行第一個增量,則將其設置為true
。 當發現非空格時,將其設置為false
僅當該變量設置為false
時才會發生增量。
您可以維護一個表示您的“狀態”的布爾值。 您是在一個空格塊中(true),還是在一個非空格塊中(false)?
import java.util.*;
import java.lang.*;
import java.io.*;
class Ideone {
public static void main(String[] args) throws java.lang.Exception {
String WORDS_GROUP = ",\n ";
String text = "This is my sample text";
int wordCount = 0;
boolean previousCharWasSpace = true;
for (int i = 0; i < text.length(); i++) {
boolean thisCharIsASpace = false;
for (int j = 0; j < WORDS_GROUP.length(); j++) {
if (text.charAt(i) == WORDS_GROUP.charAt(j)) {
previousCharWasSpace = true;
thisCharIsASpace = true;
break;
}
System.out.println("char=" + text.charAt(i) + " j=" + j
+ " previousCharWasSpace=" + previousCharWasSpace);
}
if (!thisCharIsASpace && previousCharWasSpace) {
wordCount++;
previousCharWasSpace = false;
System.out.println("char=" + text.charAt(i)
+ " previousCharWasSpace=" + previousCharWasSpace
+ " wordCount=" + wordCount);
}
}
System.out.println("wordCount=" + wordCount);
}
}
輸出:
char=T j=0 previousCharWasSpace=true
char=T j=1 previousCharWasSpace=true
char=T j=2 previousCharWasSpace=true
char=T previousCharWasSpace=false wordCount=1
char=h j=0 previousCharWasSpace=false
char=h j=1 previousCharWasSpace=false
char=h j=2 previousCharWasSpace=false
char=i j=0 previousCharWasSpace=false
char=i j=1 previousCharWasSpace=false
char=i j=2 previousCharWasSpace=false
char=s j=0 previousCharWasSpace=false
char=s j=1 previousCharWasSpace=false
char=s j=2 previousCharWasSpace=false
char= j=0 previousCharWasSpace=false
char= j=1 previousCharWasSpace=false
char=i j=0 previousCharWasSpace=true
char=i j=1 previousCharWasSpace=true
char=i j=2 previousCharWasSpace=true
char=i previousCharWasSpace=false wordCount=2
char=s j=0 previousCharWasSpace=false
char=s j=1 previousCharWasSpace=false
char=s j=2 previousCharWasSpace=false
char= j=0 previousCharWasSpace=false
char= j=1 previousCharWasSpace=false
char=m j=0 previousCharWasSpace=true
char=m j=1 previousCharWasSpace=true
char=m j=2 previousCharWasSpace=true
char=m previousCharWasSpace=false wordCount=3
char=y j=0 previousCharWasSpace=false
char=y j=1 previousCharWasSpace=false
char=y j=2 previousCharWasSpace=false
char= j=0 previousCharWasSpace=false
char= j=1 previousCharWasSpace=false
char=s j=0 previousCharWasSpace=true
char=s j=1 previousCharWasSpace=true
char=s j=2 previousCharWasSpace=true
char=s previousCharWasSpace=false wordCount=4
char=a j=0 previousCharWasSpace=false
char=a j=1 previousCharWasSpace=false
char=a j=2 previousCharWasSpace=false
char=m j=0 previousCharWasSpace=false
char=m j=1 previousCharWasSpace=false
char=m j=2 previousCharWasSpace=false
char=p j=0 previousCharWasSpace=false
char=p j=1 previousCharWasSpace=false
char=p j=2 previousCharWasSpace=false
char=l j=0 previousCharWasSpace=false
char=l j=1 previousCharWasSpace=false
char=l j=2 previousCharWasSpace=false
char=e j=0 previousCharWasSpace=false
char=e j=1 previousCharWasSpace=false
char=e j=2 previousCharWasSpace=false
char= j=0 previousCharWasSpace=false
char= j=1 previousCharWasSpace=false
char= j=0 previousCharWasSpace=true
char= j=1 previousCharWasSpace=true
char= j=0 previousCharWasSpace=true
char= j=1 previousCharWasSpace=true
char= j=0 previousCharWasSpace=true
char= j=1 previousCharWasSpace=true
char= j=0 previousCharWasSpace=true
char= j=1 previousCharWasSpace=true
char=t j=0 previousCharWasSpace=true
char=t j=1 previousCharWasSpace=true
char=t j=2 previousCharWasSpace=true
char=t previousCharWasSpace=false wordCount=5
char=e j=0 previousCharWasSpace=false
char=e j=1 previousCharWasSpace=false
char=e j=2 previousCharWasSpace=false
char=x j=0 previousCharWasSpace=false
char=x j=1 previousCharWasSpace=false
char=x j=2 previousCharWasSpace=false
char=t j=0 previousCharWasSpace=false
char=t j=1 previousCharWasSpace=false
char=t j=2 previousCharWasSpace=false
wordCount=5
您可以在這里玩: http : //ideone.com/ASEjwB
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