用代码实现5行5列的矩形，直角三角形，正三角形

public class Day5Sanjiaox {
    public static void main(String[] args) {
        for(int i=1;i<=5;i++){
            for(int j =1;j<=5;j++){
                System.out.print("*");
            }
            System.out.println();
        }
        System.out.println("---------");

        for (int x =1;x<=5;x++){
            for(int t =0;t=c;k--) {
                System.out.print(" ");
            }
            for( int j=1; j<=c;j++ ){
                System.out.print("*"+" ");
            }
            System.out.println(   );
        }
    }
}