Three ways to traverse arrays in java-Java Basics-php.cn

Three ways to traverse arrays in java

王林

Release： 2019-11-13 09:56:41

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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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