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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

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