//打印菱形
int size = 4;
for (int i = 1; i < size * 2; i++){
int n = size > i ? i : size * 2 - i;
for(int j = 0; j < Math.abs(size - i); j++) {
System.out.print(" ");
}
for(int k = 0; k < 2 * n - 1; k++) {
System.out.print("*");
}
System.out.println();
}
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