哪个学校，还在教applet

x是菱形的边长

下面给你吃

.······································.......哦

这个不难吧

我还以为是控制台输出

public static void main(String[] args) {
int n = 5; //边长
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= 2 * n - 1; j++) {
if (Math.abs(j - n) > (i - 1)) {
System.out.print(" ");
} else {
System.out.print("*");
}
}
System.out.println();
}
for (int i = n-1; i > 0; i--) {
for (int j = 2 * n - 1; j >0; j--) {
if (Math.abs(j - n) > (i -1)) {
System.out.print(" ");
} else {
System.out.print("*");
}
}
System.out.println();
}
}

修改版~~更好看
public class MainDemo2 {
public static void main(String[] args) {
int n = 5; //边长
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= 2 * n - 1; j++) {
if (Math.abs(j - n) > (i - 1)) {
System.out.print(" ");
} else {
System.out.print(" * ");
}
}
System.out.println();
}
for (int i = n-1; i > 0; i--) {
for (int j = 2 * n - 1; j >0; j--) {
if (Math.abs(j - n) > (i -1)) {
System.out.print(" ");
} else {
System.out.print(" * ");
}
}
System.out.println();
}
}
}