The method intern() creates an exact copy of a String object in the heap memory and stores it in the String constant pool.

Note that, if another String with the same contents exists in the String constant pool, then a new object won’t be created and the new reference will point to the other String.

Available Signatures

public String intern()

Example

@Test
public void whenIntern_thenCorrect() {
 String s1 = "abc";
 String s2 = new String("abc");
 String s3 = new String("foo");
 String s4 = s1.intern();
 String s5 = s2.intern();
 
 assertFalse(s3 == s4);
 assertTrue(s1 == s5);
}