public class Test
{
public static void main(String[] args) throws IOException
{
try
{
System.out.print("input a number: ");
int c = System.in.read() - '0';
if(c%2!=0)
{
new Test().prt(c);//must input a odd number
}
else
{
System.out.println("You must input a odd number!");
}
}
catch(IOException ioe)
{
ioe.printStackTrace();
}
}
public class print_star{
public static void main(String[] args){
int i=0,j=0;//i是星的行数
for(i=0;i<5;i++){
for(j=0;j<=i;j++){
System.out.print("*");
}
System.out.print("\n");
}
}
}
这样就OK了.
public class Test {
public static void main(String[] args) {
for (int i = 0; i < 5; i++) {
if (i != 0 && i != 4)
System.out.println("**");
else
System.out.println("*");
}
}
}