1234打印成1234,123,234,12,23,34,1,2,3,4 java

package interview;

public class SubStringTest {

	public static void main(String[] args) {
		String s="1234";
		for(int i=s.length();i>0;i--) {
			for(int j=0;i+j<=s.length();j++) {
				System.out.print(s.substring(j, i+j)+",");
			}
		}

	}

}