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This article is part of a series:
• Java String.String()
• Java String.contains()
• Java String.codePointCount()
• Java String.codePointAt()
• Java String.concat()
• Java String.contains()
• Java String.copyValueOf()
• Java String.endsWith()
• Java String.format()
• Java String.getBytes()
• Java String.indexOf()
• Java String.intern()
• Java String.isEmpty()
• Java String.lastIndexOf()
• Java String.regionMatches()
• Java String.replace()
• Java String.replaceAll()
• Java String.split()
• Java String.startsWith()
• Java String.subSequence()
• Java String.substring()
• Java String.toLowerCase()
• Java String.toUpperCase()
• Java String.trim()
• Java String.valueOf()

The method contains() checks if a String contains another String. The method accepts a CharSequence. So, we can pass any of the implementing classes to it such as StringBuilder and StringBuffer.

Available Signatures

public boolean contains(CharSequence s)

Example

@Test
public void whenCallContains_thenCorrect() {
    String s = "abcd";
    
    assertTrue(s.contains("abc"));
    assertFalse(s.contains("cde"));
}

I just announced the new Spring 5 modules in REST With Spring:

>> CHECK OUT THE LESSONS