11) input={"1","2","3","4"}
output=10
ie,if string
elements are nos,add it.
input={"a","b"}
output=-1;
package Set2;
public class
ClassSET11 {
public static
void main(String[] args) {
String
s[]={"1","2","3","4"};
//String
s[]={"a","b","3","4"};
System.out.println(checkForStringElements(s));
}
public static int
checkForStringElements(String[] s) {
int n=0;
boolean b=false;
for(int i=0;i<s.length;i++){
String s1=s[i];
for(int j=0;j<s1.length();j++){
char c=s1.charAt(j);
if(Character.isDigit(c))
b=true;
else{
b=false;
break;} }
if(b==true)
n+=Integer.parseInt(s1);
else{
n=-1;
break;} }
return n;
}
}