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Java String.concat() Java Java String The method concat() concatenates two Strings. Simply put, it connects them into a single String. If the length of the argument is 0, then the method simply returns the String object. Available Signatures public String concat(String str) Example @Test public void whenCallConcat_thenCorrect() { assertEquals(“elephant”, “elep”.concat(“hant”));… Continue Reading string-concat

Java String.getBytes() Java Java String The method getBytes() encodes a String into a byte array using the platform’s default charset if no argument is passed. We can pass a specific Charset to be used in the encoding process, either as a String object or a String object. Available Signatures public… Continue Reading string-get-bytes

Java String.valueOf() Java Java String The method valueOf() has several overloads that accept one parameter of different types and convert them to a String. Examples include boolean, char, char array, double, int and long. We can also convert a part of a char array to a String by passing: offset… Continue Reading string-value-of

Java String.substring() Java Java String The method substring() comes with two signatures. If we pass the beginIndex and the endIndex to the method, then it obtains a part of a String given the starting index and the length of the result. We can also pass the beginIndex only and obtain… Continue Reading string-substring

Java String.isEmpty() Java Java String The method isEmpty() is a convenience method that checks if the size of a String is equal to zero. Available Signatures public boolean isEmpty() Example @Test public void whenCallIsEmpty_thenCorrect() { String s1 = “”; assertTrue(s1.isEmpty()); } Next » Java String.lastIndexOf() « Previous Java String.intern()

Java String.indexOf() Java Java String 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… Continue Reading string-index-of

Java String.String() Java Java String String objects can be created by either using literals: String s = “a string”; or by calling one of the constructors: String s = new String(“a string”); If we use the String literal, it’ll try to reuse already existing object from the String constant pool. On… Continue Reading string-constructor

Java String.regionMatches() Java Java String The method regionMatches() checks if two String regions are equal. Here are a few important points: ignoreCase specifies whether we should ignore the case of both Strings toffset determines the starting index of the first String other specifies the second String. ooffset specifies the starting… Continue Reading string-region-matches

Java String.toUpperCase() Java Java String The method toUpperCase() converts all characters of a String to upper 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-upper-case

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