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<?xml
version="1.0" encoding="utf-8"?>
<manifest
xmlns:android="http://schemas.android.com/apk/res/android"
   
package="com.android.calculator2">
    <application
android:label="@string/app_name"
android:icon="@drawable/icon">
        <activity
android:name="Calculator"
                 
android:theme="@android:style/Theme.Black.NoTitleBar">
            <intent-filter>
                <action
android:name="android.intent.action.MAIN" />
                <category
android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>
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public static void append(String str){
str += " Append!";
}
public static void append(StringBuffer sBuffer){
sBuffer.append(" Append!");
}
public void test(){
String str = "Nothing";
append(str);
System.out.println(str);
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