大神们看看哪里有问题？谢谢

package HelloWorld;

public class HelloWorld{

public static void main (String args[]){

char[] a={'a','b','c','d','e'};

for(int i=0; i<=a.length/2; i++){

char c=a[i];

a[i]=a[a.length-(i-1)];

a[a.length-(i-1)]=c;

}

System.out.printf("%c%c%c%c%c",a[0],a[1],a[2],a[3],a[4]);

}

}