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String s = "Hello world!";
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import java.util.regex.Matcher;
import java.util.regex.Pattern;
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Integer n1 = new Integer(1);
Integer n2 = new Integer(1);
System.out.println(n1==n2); // false
Integer n1 = new Integer(3);
Integer n2 = new Integer(3);
System.out.println(n1.equals(n2)); //true

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