public class Second {
public Second left;
public Second right;
public Integer value;
public Second(Second left, Second right, Integer value) {
this.left = left;
this.right = right;
this.value = value;
}
public Second(Integer value) {
this(null, null, value);
}
Integer res = 0;
try {
res = Integer. parseInt(aString, 16);
} catch(NumberFormatException ex) {
System.out.println("кисо, куку!")
}