java实验三 控制语句

1、对输入的字符串进行反转并显示

2、输出下面图形

//lsy
package java_experiments;

import java.util.Scanner;

public class three {
	static void reverse() {
		@SuppressWarnings("resource")
		Scanner in = new Scanner(System.in);
		System.out.println("请输入需要反转的字符串：");
		String str = in.next();
		char[] c = new char[str.length()];
		for (int i = 0; i < str.length(); i++)
			c[i] = str.charAt(str.length() - 1 - i);
		System.out.println("反转后的字符串为：" + String.valueOf(c));

	}

	static void lingxing() {
		Scanner input = new Scanner(System.in);
		System.out.println("input a number:");
		int n = input.nextInt();
		for (int i = 1; i <= n; i++) {
			for (int j = n - i - 1; j >= 0; j--) {
				System.out.print("  ");
			}
			System.out.print(i);
			for (int j = 4 * (i - 1) - 2; j >= 0; j--) {
				System.out.print(" ");
			}
			if (i == 1)
				System.out.println();
			else
				System.out.println(i);
		}
		for (int i = 1; i < n; i++) {
			for (int j = 1; j < i + 1; j++) {
				System.out.print("  ");
			}
			System.out.print(n - i);
			for (int j = 4 * (n - i - 1) - 2; j >= 0; j--)
				System.out.print(" ");
			if (i == n - 1)
				System.out.println();
			else
				System.out.println(n - i);
		}
		input.close();

	}

	public static void main(String[] args) {
		reverse();
		lingxing();

	}

}