Java删除字符串中的小写字母然后输字符串

public String info1(String arr){
char[] a=arr.toCharArray();
for (int i = 0,j=a.length-1;i<j; i++,j–)
{
char temp=a[i];
a[i]=a[j];
a[j]=temp;
}
String brr= String.valueOf(a);
return brr;
}
public String info2(String arr){
// num2 w=new num2();
// String temp=w.info1(arr);
char[] op=arr.toCharArray();
// System.out.println(temp);
//System.out.println(Arrays.toString(op));
int m = 0;
for (int i= 0; i < op.length; i++) {
if (op[i]<‘a’ || op[i]>‘z’)
{
m++;
}
}
// System.out.println(m);
char[] t = new char[m];
int k = 0;
for (int i = 0; i < op.length; i++) {
if (op[i] <‘a’ || op[i] >‘z’) {
t[k] = op[i];
k++;
}
}
String trr= String.valueOf(t);
return trr;
}
public static void main(String[] args)
{
String arr=“!!!god a si CQ”;
num2 p =new num2();
String temp=p.info1(arr);
System.out.println(p.info1(arr));
System.out.println(p.info2(temp));
}
}