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public class Test {
public static void main(String[] arg) {
String a = "PO 000050770784 300 301 302 303 ";
String[] b = a.split(" +");
String OPT = b[0];
String USER = b[1];
System.out.println("OPT=" + OPT);
System.out.println("USER=" + USER);
String[] PRODUCT = new String[b.length - 2];
for(int i = 0; i < PRODUCT.length; i++) {
PRODUCT[i] = b[i+2];
System.out.println("PRODUCT(" + i + ")=" + PRODUCT[i]);
}
}
}