如何用java输出下列内容

Question

 

Answer 1

public class HelloWorld {
    public static void main(String []args) {
		int n=5;
		int i=1;
		while(i<=n){
			for(int k=i;k<n;k++)
				System.out.print(" ");
			for(int k=0;k<2*i-1;k++)
				System.out.print(i);
			System.out.println();
			i++;
		}
		i=n-1;
		while(i>=1){
			for(int k=i;k<n;k++)
				System.out.print(" ");
			for(int k=0;k<2*i-1;k++)
				System.out.print(i);
			System.out.println();
			i--;
		}
    }
}