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public static boolean isNumeric(String str) {
for (int i = str.length(); i = 0;) {
if (!Character.isDigit(str.charAt(i))) {
return false;
}
}
return true;
}
public static boolean isNumeric(String str) {
Pattern pattern = Pattern.compile("[0-9]*");
return pattern.matcher(str).matches();
}
public static boolean isNumeric(String str) {
if (str.matches("““d*")) {
return true;
}
return false;
}
public static boolean isNumeric(String str) {
for (int i = str.length(); i = 0;) {
int chr = str.charAt(i);
if (chr 48chr 57)
return false;
}
return true;
}
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integer
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long¡¢java.lang.Long
long
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float¡¢java.lang.Float
float
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//For other protocol, do it yourself
import java.net.*;
import java.io.*;
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