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Sep 17, 2008 · Here's a simple method that will concatenate two arrays and return the result: public <T> T[] concatenate(T[] a, T[] b) { int aLen = a.length; int bLen = b.length ...
Jul 23, 2017 · String[][] arrays = new String[][] { array1, array2, array3, array4, array5 }; (The latter syntax can be used in assignments other than at the point of the variable declaration, whereas the shorter syntax only works with declarations.) answered Jan 24, 2011 at 10:54. Jon Skeet.
Mar 13, 2015 · You can simply use the new Java 8 Streams but you have to work with int.. The stream method of the utility class Arrays gives you an IntStream on which you can use the min method.
Nov 7, 2009 · // our initial int[] array containing primitives int[] arrOfPrimitives = new int[]{1,2,3,4,5,6}; // we have to convert it into array of Objects, using java's boxing Integer[] arrOfObjects = new Integer[arrOfPrimitives.length]; for (int i = 0; i < arrOfPrimitives.length; i++) arrOfObjects[i] = new Integer(arrOfPrimitives[i]); // now when we have an array of Objects we can use that nice built-in method Arrays.sort(arrOfObjects, Collections.reverseOrder());
Oct 5, 2009 · Java collections Arrays.asList takes var-arg of type T (T ...). If you pass a primitive array (int array), asList method will infer and generate a List<int[]> , which is a one element list (the one element is the primitive array). if you shuffle this one element list, it won`t change any thing.
You can, however, have a List<Integer> using the Integer class that wraps the int primitive. Convert your array to a List with the Arrays.asList utility method. Integer[] numbers = new Integer[] { 1, 2, 3 }; List<Integer> list = Arrays.asList(numbers); See this code run live at IdeOne.com.
It's not very convenient writing Arrays.toString(arr);, then importing java.util.Arrays; all the time. Please note, this is not a permanent fix by any means. Just a hack that can make debugging simpler. Printing an array directly gives the internal representation and the hashCode. Now, all classes have Object as the parent-type.
Dec 29, 2010 · If you're using Java 8, the Arrays class provides a stream(int[] array) method which returns a sequential IntStream with the specified int array. It has also been overloaded for double and long arrays. int [] arr = {1,2,3,4}; int sum = Arrays.stream(arr).sum(); //prints 10
Jan 26, 2010 · Swap the elements at the start and the end index. Step 2. Increment the start index decrement the end index. Step 3. Iterate Step 1 and Step 2 till start index < end index. For this, the time complexity will be O (n) and the space complexity will be O (1) Sample code for reversing an array in space is like:
Oct 6, 2012 · Arrays are Objects, yes, but nothing in Java is passed by reference. All parameter passing is by value. In the case of an Object, what gets passed is a reference to the Object (i.e. a pointer), by value. Passing a reference by value is not the same as pass by reference. – aroth.
