编写java程序应用for打印出实心菱形

Question

Answer 1

 public static void main(String[] args) throws Exception {
        char char0=' ';
        char char1='*';
        int c=6;
        int width=2*c-1;
        for(int i=1;i<c*2;i++){
            int m=0;
            if(i<c){
                m=i*2-1;
            }else{
                m=(2*c-i)*2-1;
            }
            int n=(width-m)/2;
            for(int j=1;j<=width;j++){
                if(j>n && j<=m+n){
                    System.out.print(char1);
                }else {
                    System.out.print(char0);
                }
            }
            System.out.println();
        }
    }