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Merging java.util.Properties Objects 1. Introduction In this short tutorial, we’ll focus on how to merge two or more Java Properties objects into one. We’ll explore three solutions, firstly starting with an example using iteration. Next, we’ll look into using the putAll() method and to conclude the tutorial, we’ll look at… Continue Reading java-merging-properties
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Overriding System Time for Testing in Java 1. Overview In this quick tutorial, we’ll focus on different ways to override the system time for testing. Sometimes there’s a logic around the current date in our code. Maybe some function calls such as new Date() or Calendar.getInstance(), which eventually are going to… Continue Reading java-override-system-time
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Java String.charAt() Java The method charAt() returns the character at the specified index. The index value must be between 0 and String.length() – 1. Available Signatures public char charAt(int index) Example @Test public void whenCallCharAt_thenCorrect() { assertEquals(‘P’, “Paul”.charAt(0)); } Throws IndexOutOfBoundsException – if a non-existent or a negative index is… Continue Reading string-char-at
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Java String.codePointCount() Java Java String The method codePointCount() returns the number of Unicode code points in the specified range. The text range begins at the first index and ends at the second index – 1. Available Signatures public int codePointCount(int beginIndex, int endIndex) Example @Test public void whenCallCodePointCount_thenCorrect() { assertEquals(2,… Continue Reading string-code-point-count
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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
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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
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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
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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
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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()
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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
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