Java基础之两个小算法

博客出自：http://blog.csdn.net/liuxian13183，转载注明出处！ All Rights Reserved ! 

遍历二维数组

package com.blog.test;

public class TestLoop {
	public static void main(String[] args) {
		int cal = 0;

		String[][] array = new String[7][6];

		for (int i = 0; i < array.length; i++) {// 遍历纵向的数据

			for (int j = 0; j < array[i].length; j++) {// 遍历横向的数据

				System.out.print(array[i][j] + "a" + "\t");

				++cal;

				if (cal % 7 == 0) {

					System.out.println();

				}

			}

		}
	}
}

输入出“请输入一个数字：”--》判断--》是数字的话，打出该数字；不是的话，再输出“请输入数字：”！

package com.blog.test;

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class TestCalculate {
	static TestCalculate b = new TestCalculate();

	public static void main(String[] args) throws Exception {
		b.isNumber();
	}

	public String deal() throws Exception {
		BufferedReader buf = new BufferedReader(new InputStreamReader(System.in));
		System.out.print("請輸入一列数字: ");
		String a = buf.readLine();
		return a;
	}

	public void isNumber() throws Exception {
		String str = b.deal();
		boolean isNumber = true;
		char[] ch = str.toCharArray();
		for (int k = 0; k < ch.length && isNumber == true; k++) {
			isNumber = Character.isDigit(ch[k]);
			if (isNumber) {
				System.out.println("您输入的数字是:" + str);
				int c = Integer.parseInt(str);
				for (int i = c; i > 0; i--) {
					for (int j = i; j > 0; j--) {
						System.out.print(j + " ");
					}
					System.out.println();
				}
				break;
			} else {
				b.isNumber();
			}
		}
	}

}