有趣的题

1.实现一个方法将一个字符串的奇数位取出，如传的是ahbhchd，就返回abcd

 

public class Test {

	public static void main(String args[]) {
		Test t = new Test();
		String result = t.getJiShuChuan("ahbhchdhehf");
		System.out.println(result);
	}
	
	public String getJiShuChuan(String src) {
		StringBuffer buffer = new StringBuffer(src);
		int len = buffer.length();
		if (len > 1) {
			for (int i=1;i<len;i++,len--) {
				buffer.deleteCharAt(i);
				
			}
		}
		return buffer.toString();
	}
}

 

2.输出一个菱形

 

public class Test2 {
	
	public static void main(String args[]) {
		Test2 t = new Test2();
		t.print(25);
	}

	public void print(int n) {
		for (int i = 0; i < n / 2; i++) {
			int num1 = (i + 1) * 2 - 1;
			int num2 = (n - num1) / 2;
			printSpace(num2);
			printNum(num1);
			printSpace(num2);
			System.out.println();
		}
		printNum(n);
		System.out.println();
		for (int i=n/2;i>0;i--) {
			int num1 = 2*i - 1;
			int num2 = (n-num1)/2; 
			printSpace(num2);
			printNum(num1);
			printSpace(num2);
			System.out.println();
		}
	}

	private void printSpace(int n) {
		for (int i = 0; i < n; i++) {
			System.out.print("  ");
		}
	}

	private void printNum(int n) {
		for (int i = 0; i < n; i++)
			System.out.print(" *");
	}
}