30 lines
789 B
Java
30 lines
789 B
Java
//: references/Cloning.java
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// The clone() operation works for only a few
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// items in the standard Java library.
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import java.util.*;
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class Int {
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private int i;
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public Int(int ii) { i = ii; }
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public void increment() { i++; }
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@Override
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public String toString() { return Integer.toString(i); }
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}
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public class Cloning {
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@SuppressWarnings("unchecked")
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public static void main(String[] args) {
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ArrayList v = new ArrayList();
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for(int i = 0; i < 10; i++ )
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v.add(new Int(i));
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System.out.println("v: " + v);
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ArrayList v2 = (ArrayList)v.clone();
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// Increment all v2's elements:
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for(Iterator e = v2.iterator();
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e.hasNext(); )
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((Int)e.next()).increment();
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// See if it changed v's elements:
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System.out.println("v: " + v);
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}
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} ///:~
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