打印如下空心矩形（java中的循环）

for (int i = 1; i < 6; i++) {
int j = 10;//10是个星
if (i == 1 || i == 5) {
while (j-- > 0){
System.out.print("*");
}
} else {
System.out.print("*");
while (j-- > 2) {
System.out.print(" ");
}
System.out.print("*");
}
System.out.println("");
}
}

这个也很简单的嘛关键就是循环
public class Run {
public static void main(String[] args) {
for (int i = 0; i < 8; i++) {
for (int j = 0; j < 10; j++) {
if (i == 0 || i == 7 || j == 0 || j == 9) {
System.out.print("*");
} else {
System.out.print(" ");
}
}
System.out.println();
}
}
}

还帮你敲了一遍 赫赫

int n=5;
for(int i=0;i if(i==0||(n-1-i==0)){
for(int k=0;k<16;k++){
System.out.print(''*");
}
System.out.println("\n");
}else{
for(int s=0;s<16;s++){
if(s==0 ||(15-s==0)) System.out.print("*");
else System.out.print(" ");
}
System.out.println("\n");
}
}

for(int i = 1; i < 6; i ++){
int j = 10;//10是个星
if(i == 1 || i == 5) while(j -- ) System.out.print("*");
else{
System.out.print("*");
while(j-- > 2)System.out.print(" ");
System.out.print("*");
}
}

public class Run
{
public static void main(String[] args)
{
for (int i = 1; i < 6; i++)
{
for (int j = 1; j < 17; j++)
{
if (i == 1 || i == 5|| j == 1|| j == 16)
{
System.out.print("*");
}
else
{
System.out.print(" ");
}
}
System.out.println();
}
}
}