Set up Java SDK

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import com.launchdarkly.sdk.*;
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import com.launchdarkly.sdk.server.*;
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public class Main {
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  public static void main(String[] args) {
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    LDConfig config = new LDConfig.Builder().build();
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    // Set your LaunchDarkly SDK key.
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    // This is inlined as example only for onboarding.
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    // Never hardcode your SDK key in production.
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    final LDClient client = new LDClient("YOUR_SDK_KEY", config);
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    if (client.isInitialized()) {
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      // For onboarding purposes only we flush events as soon as
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      // possible so we quickly detect your connection.
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      // You don't have to do this in practice because events are automatically flushed.
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      client.flush();
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      System.out.println("SDK successfully initialized!");
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    }
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  }
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}