Search sub string

ReturnMethodSummary
intindexOf(String str)Returns the index within this string of the first occurrence of the specified substring.
intindexOf(String str, int fromIndex)Returns the index within this string of the first occurrence of the specified substring, starting at the specified index.
intlastIndexOf(String str)Returns the index within this string of the rightmost occurrence of the specified substring.
intlastIndexOf(String str, int fromIndex)Returns the index within this string of the last occurrence of the specified substring.

public class Main {
  public static void main(String[] argv) {
    StringBuilder sb = new StringBuilder();
    sb.append("java2s.com");
    
    int index = sb.indexOf("com");
    
    System.out.println(index);

  }
}

The output:


7

public class Main {
  public static void main(String[] argv) {
    StringBuilder sb = new StringBuilder();
    sb.append("java2s.com");
    sb.append(123);
    sb.append(1.23);
    sb.append(true);
    sb.insert(4,"JAVA2S.COM");
    System.out.println(sb.toString());

  }
}

The output:


javaJAVA2S.COM2s.com1231.23true
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