[java] 文字列を整数に変換

●文字列を整数に変換

Integer.parseInt(str)

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class Sample{

    public static void main(String[] args) {
        // TODO code application logic here
        String str = "4";
        int num = Integer.parseInt(str);
        System.out.println(num);
    }

}
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[Java] HTMLファイル取得

●URL
openStream()

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import java.io.*;
import java.net.*;

class URLDemo{
	public static void main(String args[]){
		try{
			//
			URL url = new URL(args[0]);
			//
			InputStream is = url.openStream();
			//
			byte buffer[] = new byte[1024];
			int i;
			while((i = is.read(buffer)) != -1){
				System.out.write(buffer, 0, i);
			}
		}
		catch(Exception e){
			e.printStackTrace();
		}
	}
}
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使用例　JAVA URLDemo http://yahoo.co.jp/

[Java] ローカルアドレスの取得2

●ローカルアドレスの取得２
getLocalHost()

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import java.net.*;

public class IPAddress2 {

	public static void main(String args[]) {
		//
		InetAddress host = null;
		try {
			host = InetAddress.getLocalHost();
		}
		catch(UnknownHostException e) {
			System.err.println(e);
			return;
		}
		System.out.println(host);

	}

}
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