谁知道怎么用JAVA编写一个倒三角形

for (int i = NUM; i > 0; i=i-2) {
for (int k = 0; k < (NUM-i)/2; k++) {
System.out.print(" ");
}
for (int j = 0; j < i; j++) {
System.out.print("*");
}
System.out.println();
}

你其中的NUM换成数字就行了

public class a
{

private static final int N = 5;

public static void main(string [] args)
{
for(int i = 0; i < N; i++)
{
for(int j = 0; j < i; j++)
{
system.out.print(" ");
}

for(int j = 0; j < N - 2 * i; j++)
{
system.out.print("*");
}

system.out.println("");

}
}
}

1