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The method indexOf() returns the first occurrence index of a character or a String in another String. We can pass the index of the character to start searching from.

Note that the method returns -1 if the passed value is not found.

Available Signatures

public int indexOf(int ch)
public int indexOf(int ch, int fromIndex)
public int indexOf(String str)
public int indexOf(String str, int fromIndex)

Example

@Test
public void whenCallIndexOf_thenCorrect() {
    String str = "foo";
    
    assertEquals(1, str.indexOf("o"));
    assertEquals(-1, str.indexOf("s"));
}
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