Three ways to traverse arrays in java-JavaBase-php.cn

Three ways to traverse arrays in java

1. For loop traversal

Usually traversing an array is implemented using a for loop. Traversing a one-dimensional array is very simple. Traversing a two-dimensional array requires a double-layer for loop. The length of the array can be obtained through the length property of the array.

Program example:

package captain; public class ArrayDemo { public static void main(String[] args) { // TODO Auto-generated method stub int arr[][] = new int[][]{{1},{2,3},{4,5,6}}; //for循环遍历二维数组。 for(int i = 0; i < arr.length; i++){ for(int j = 0; j < arr[i].length; j++){ System.out.print(arr[i][j]); } System.out.println(); } } }

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2. Foreach statement traversal

When traversing an array, it is simpler to use the foreach statement.

Program example:

package captain; public class ArrayDemo2 { public static void main(String[] args) { // TODO Auto-generated method stub int arr[][] = new int[][]{{4,3},{1,5}}; //foreach语句遍历二维数组。 System.out.println("数组中的元素是："); for(int x[]:arr){ //外层遍历得到一维数组 for(int e:x){ //内层遍历得到数组元素 System.out.print(e); } System.out.println(); } } }

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3. ToString static method traversal in the Arrays tool class

Use the toString static method in the Arrays tool class to traverse a The dimensional array is converted into string form and output.

Program example:

package captain; import java.util.Arrays; public class ArrayDemo3 { public static void main(String[] args) { // TODO Auto-generated method stub //Arrays工具类的toString静态方法遍历二维数组。 int arr[][] = new int[][]{{9,8},{7,6,5}}; for(int i = 0; i < arr.length; i++){//循环得到一维数组 System.out.println(Arrays.toString(arr[i]));//将一维数组转化为字符串输出 } } }

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