How to compare strings in Java?
String comparison in Java == performs a reference equality check, whether the 2 objects (strings in this case) refer to the same object in the memory. The equals() method will …
Read MoreTag: string
How to convert java string array to string with delimiter
Using String.join method (from java 8)
|
1 2 |
String[] array = new String[] { "a", "b", "c" }; String joined2 = String.join(",", array); |
Using simple for-loop expression
|
1 2 3 4 5 6 |
StringBuilder sb = new StringBuilder(); for (String n : name) { if (sb.length() > 0) sb.append(','); sb.append("'").append(n).append("'"); } return sb.toString(); |
Read More
How to convert an int to a formatted string in java
Using java.util.formatter
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 |
StringBuilder sb = new StringBuilder(); // Send all output to the Appendable object sb Formatter formatter = new Formatter(sb, Locale.US); // Explicit argument indices may be used to re-order output. formatter.format("%4$2s %3$2s %2$2s %1$2s", "a", "b", "c", "d") // -> " d c b a" // Optional locale as the first argument can be used to get // locale-specific formatting of numbers. The precision and width can be // given to round and align the value. formatter.format(Locale.FRANCE, "e = %+10.4f", Math.E); // -> "e = +2,7183" // The '(' numeric flag may be used to format negative numbers with // parentheses rather than a minus sign. Group separators are // automatically inserted. formatter.format("Amount gained or lost since last statement: $ %(,.2f", balanceDelta); // -> "Amount gained or lost since last statement: $ (6,217.58)" |
See the Formatter docs for other modifiers.
Read MoreConvert String array to string in java
In this article, we’ll look at the String array convert to String. This can be useful for example to log query parameters.
Read MoreHow to repeat string n times in java?
Suppose you have the string ‘qwe’ and you need to repeat string ‘n’ times. Here’s how to do it: Using java 8 stream api
|
1 2 3 4 5 |
String newString = Collections.nCopies(3, "qwe").stream().collect(Collectors.joining("")); String newString = Stream.generate(() -> "qwe").limit(3).collect(Collectors.joining()); String newString = String.join("", Collections.nCopies(n, s)); |
Using String.format
|
1 2 3 4 |
String s = "qwe"; int n = 3; //this line print 'qweqweqwe' String newString = String.format("%0" + n + "d", 0).replace("0", s); |
Let us examine …
Read MoreHow to compare strings in Java?
Test strings equality == tests object references, .equals() tests the string values. Sometimes it looks as if == compares values, because Java does some behind-the-scenes stuff to make sure identical …
Read More