Question

String word="i love apples i love orange";
String w=scan.next();
    int index = word.indexOf(w);
    System.out.println (index);
while (index >= 0) {
    System.out.println(index);
    index = word.indexOf(w, index + 1);
}

所以我知道这段代码会告诉我爱的索引是（2,17）但我正在寻找的是，我希望它为我返回单词的索引（1,4），即它计算字符串中的字符串而不是字符......我还需要它来表示索引每次它发现它像上面那个感谢

Answer 1

如果在您的变量“word”中单词仅使用空格分隔，则可以使用此类代码

String word="i love apples i love orange";
String w=scan.next();
String[] words = word.split(" ");
for (int i=0; i< words.length; i++){
    if (words[i].equals(w)){
        System.out.println(i);
    }
}

更新：如果你想数字，试试这个 -

String word="i love apples i love orange";
String w=scan.next();
String[] words = word.split(" ");
int count = 0;
for (int i=0; i< words.length; i++){
    if (words[i].equals(w)){
        System.out.println(i);
        count ++;
    }
}
System.out.println("Count = "+count);

Answer 2

此代码查找单词中输入的位置以及单词在字符串中的位置。

public static void main(String[] args) {
    int lastIndex = 0;
    Scanner scan = new Scanner(System.in);
    String w = scan.next();

    String word = "i love apples i love orange";
    String[] tokens = word.split(" ");

    for (String token : tokens) {
        if (token.contains(w)) {
            for (int x = 0; x < token.length(); x++) {
                System.out.println("Input found in token at position: " + (token.indexOf(w) + 1));
            }

            System.out.println("Word found containing input in positions: " + (word.indexOf(token, lastIndex) + 1)
                    + "-" + ((word.indexOf(token, lastIndex)) + token.length()));
            lastIndex = ((word.indexOf(token,lastIndex)) + token.length());
        }
    }
}

Answer 3

此代码每次在段落（str）中找到字符串（针）。针可以包含空格，每次都会打印单词索引。

String str = "i love apples i love orange";
String needle = "i love";
int wordIndex = 0;
for (int start = 0; start < str.length(); start++) {
  if (Character.isWhitespace(str.charAt(start))) wordIndex++;
  if (str.substring(start).startsWith(needle)) {
    System.out.println(wordIndex);
  }
}

Answer 4

package JavaPractice;

public class CountNumberOfWords {
public static void main(String[] args) {
    String str = "My name is srikanth. srikanth is working on a java program. " + 
            "srikanth dont know how many errors atr there. so, " +
            "srikanth is going to find it.";
    String Iwant = "srikanth";
    int wordIndex = 0;
    int count =0;
    for (int start = 0; start < str.length(); start++) {
      if (Character.isWhitespace(str.charAt(start))) wordIndex++;
      if (str.substring(start).startsWith(Iwant)) {
        System.out.println("Index of the String Iwant "+wordIndex);
        count++;
      }
    }
    System.out.println("Number of times srikanth in str is="+count);

}
}

输出：

Index of the String Iwant 3
Index of the String Iwant 4
Index of the String Iwant 11
Index of the String Iwant 20
Number of times srikanth in str is=4

每次出现时段落中String的索引

4 个答案: