當(dāng)用戶輸入單詞時(shí)，系統(tǒng)會(huì)提示他們輸入子字符串的第一個(gè)和第二個(gè)索引。我已經(jīng)排序了這么多，但是當(dāng)我嘗試驗(yàn)證使用下面的 if 語句輸入的索引時(shí)，我收到了有關(guān)這些 if 語句的錯(cuò)誤，import java.util.Scanner;public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); String inputString; int startIndex; int endIndex; System.out.println("Enter a string : "); inputString = scanner.nextLine(); System.out.println("Enter the first index of the substring : "); startIndex = scanner.nextInt(); if (int startIndex > inputSting.length) { System.out.println("Index is not in string length, try again."); } System.out.println("Enter the second index of the substring : "); endIndex = scanner.nextInt(); if (int endIndex > inputSting.length) { System.out.println("Index is not in string length, try again."); } char[] ch = new char[endIndex - startIndex + 1]; inputString.getChars(startIndex, endIndex + 1, ch, 0); System.out.println("Output : " + String.valueOf(ch)); }}
2 回答
天涯盡頭無女友
TA貢獻(xiàn)1831條經(jīng)驗(yàn) 獲得超9個(gè)贊
你的代碼絕對(duì)不是Java語言。
第一的：
if (int startIndex > inputSting.length) { .. }您不能在if語句內(nèi)或比較表達(dá)式中聲明變量，而且該變量startIndex已經(jīng)存在。
第二：
inputSting變量不存在并且它肯定沒有屬性length。inputString可能是+ string 有方法length()而不是屬性的拼寫錯(cuò)誤。
開滿天機(jī)
TA貢獻(xiàn)1786條經(jīng)驗(yàn) 獲得超13個(gè)贊
更改以下內(nèi)容：
int startIndex到startIndex,
int endIndex到endIndex,
inputSting.length到inputString.length()
所以固定代碼，
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
String inputString="";
int startIndex;
int endIndex;
System.out.println("Enter a string : ");
inputString = scanner.nextLine();
System.out.println("Enter the first index of the substring : ");
startIndex = scanner.nextInt();
if ( startIndex > inputString.length()) {
System.out.println("Index is not in string length, try again.");
}
System.out.println("Enter the second index of the substring : ");
endIndex = scanner.nextInt();
if ( endIndex > inputString.length()) {
System.out.println("Index is not in string length, try again.");
}
char[] ch = new char[endIndex - startIndex + 1];
inputString.getChars(startIndex, endIndex + 1, ch, 0);
System.out.println("Output : " + String.valueOf(ch));
}
}
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