public class $ {
public static void main(String... _) {
String str = "123456789 abcdefg hijklmn...";
System.out.println(str.indexOf("456"));
System.out.println(str.indexOf("45a"));
}
}
ç»æ:
3
-1
å¦ææ,å°±è¿åä»çèµ·å§ä½ç½®,注ææ¯ä»0å¼å§
没æ,å°±è¿å-1
ç¨å¾ªç¯
String[] key = { "456", "abc", "45a" };
String str = "123456789 abcdefg hijklmn...";
for (int i = 0; i < key.length; i++) {
System.out.println(key[i] + "çèµ·å§ä½ç½®:" + str.indexOf(key[i]));
}
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