Java中四种循环语句

Java中循环有while、do…while…，for，增强for

public static void main(String[] args) {
	Scanner sc = new Scanner(System.in);
	System.out.println("请输入一个数字:");
	int n = sc.nextInt();
	int i = 1;
	while (i <= n) {
		System.out.print(i+" ");
		i++;
	}
}

即使循环条件不满足，也至少执行一次

public static void main(String[] args) {
	int i = 1;
	do {
		System.out.print(i + " ");
		i++;
	} while (i < 6);
}

public static void main(String[] args) {
	for (int i = 0; i < 6; i++) {
		System.out.print(i + " ");
	}
}

一般用于遍历数组和集合，数据类型为数组或集合的数据类型

public static void main(String[] args) {
	int[] intArr = {1, 2, 3, 4, 5};
	for (int i : intArr) {
		System.out.print(i + " ");
	}
}