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import java.nio.CharBuffer;
public class Test03 {
public static void main(String[] args) {
char[] c_arr = "helloPPP".toCharArray();
CharBuffer cbuffer = CharBuffer.wrap(c_arr);
String s="world";
for (int i = 0; i < s.length(); i++) {
c_arr[i]=s.charAt(i);
}
cbuffer.flip();
while(cbuffer.hasRemaining())
System.out.print(cbuffer.get()+" ");
}
}