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Java String.intern() Java Java String 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… Continue Reading string-intern

Java String.codePointAt() Java Java String The method codePointAt() takes an int as a parameter and returns the code point at the specified index. A code point is a decimal value that the character is given in the Unicode standard. Available Signatures public int codePointAt(int index) Example @Test public void whenCallCodePointAt_thenDecimalUnicodeReturned()… Continue Reading string-code-point-at

Java String.startsWith() Java Java String The method startsWith() is a convenience method that checks whether a String starts with another String. We can also pass the index of the first character to start checking from. Available Signatures public boolean startsWith(String prefix) public boolean startsWith(String prefix, int toffset) Example @Test public… Continue Reading string-starts-with

Java String.replaceAll() Java Java String The method replaceAll() replaces all occurrences of a String in another String. Available Signatures public String replaceAll(String regex, String replacement) Example @Test public void whenCallReplace_thenCorrect() { String s = “I learn Spanish”; assertEquals(“I learn French”, s.replaceAll(“Spanish”, “French”)); } Next » Java String.split() « Previous Java… Continue Reading string-replace-all

Java String.copyValueOf() Java Java String The method copyValueOf() converts a character array to a String with the same contents. This method is equivalent to valueOf(char[]). The offset represents the index of the first element to start copying from, and the count represents the number of elements to copy. Available Signatures… Continue Reading string-copy-value-of

Java String.split() Java Java String The method split() splits a String into multiple Strings given the delimiter that separates them. The returned object is an array which contains the split Strings. We can also pass a limit to the number of elements in the returned array. If we pass 0… Continue Reading string-split

Java String.toLowerCase() Java Java String The method toLowerCase() converts all characters of a String to lower case. If no Locale is passed to the method, then it will use the default Locale. However, it may produce unexpected results if it’s run on a system whose default Locale is different. To… Continue Reading string-to-lower-case

Java String.trim() Java Java String The method trim() removes any whitespace at the beginning and at the end of a String. If the String contains only spaces, then the method returns an empty String. Available Signatures public String trim() Example @Test public void whenTrim_thenCorrect() { assertEquals(“foo”, ” foo “.trim()); }… Continue Reading string-trim

Java String.format() Java Java String The method format() formats a String using a format String and arguments. For example, characters ‘s’ and ‘S’ evaluate to “null” if the argument arg is null. If arg implements Formattable, then the method Formattable, then the method arg.formatTo() is invoked. Otherwise, the result is… Continue Reading string-format

Java String.lastIndexOf() Java Java String The method lastIndexOf() returns the index of the last occurrence of a String in another String. If an int is passed to the method, then the method searches for the Unicode character equivalent. We can also pass the index of the character to start searching… Continue Reading string-last-index-of