for循环能用吗？
public static void main(String[] args) {
TestClass tc = new TestClass();
System.out.println("需要的圣诞树的大小:");
Scanner input = new Scanner(System.in);
int a = input.nextInt();
tc.Tree(2 * a);
}
public void Tree(int n) {
int i, j, k, m;
for (i = 1; i <= n / 2; i++) {
for (j = 1; j < n / 2 + i; j++) {
if (j <= n / 2 - i)
System.out.print(" ");
else {
if (j % 2 == 0)
System.out.print("*");
else
System.out.print("*");
}
}
System.out.print("\n");
}
for (k = n / 2 + 1; k <= n - n / 4; k++) {
for (m = 1; m <= n + 1; m++) {
if (m != n / 2)
System.out.print(" ");
else
System.out.print("|");
}
System.out.print("\n");
}
}[code="java"][/code][code="java"][/code]
[code="java"]
public class App {
/**
* @author: lance
* @Title: main
* @param args
* @return: void
*/
public static void main(String[] args) {
int treeHeight = 10;
char treeChar = 'A';
for (int h=1; h <= treeHeight; h++) {
for (int sp=1; sp <= treeHeight-h; sp++) {
System.out.print(" ");
}
for (int t=1; t <= (2*h - 1); t++) {
System.out.print(treeChar);
}
System.out.println();
}
for (int tr=1; tr <= treeHeight/4; tr++) {
for (int sp=1; sp <= treeHeight - 2; sp++) {
System.out.print(" ");
}
System.out.print(treeChar);
System.out.print(treeChar);
System.out.println(treeChar);
}
}
}
[/code]