JAvaルーチン練習(ベースデータ型のパッケージクラス)

public class Test {
	public static void main(String[] args) {
		Integer i = new Integer(100);
		Double d = new Double("123.456");
		
		int j = i.intValue() + d.intValue();
		float f = i.floatValue() + d.floatValue();
		System.out.println(j);
		System.out.println(f);
		
		double pi = Double.parseDouble("3.1415926");
		double r = Double.valueOf("2.0").doubleValue();
		double s = pi * r * r;
		System.out.println(s);
		
		try {
			int k = Integer.parseInt("1.23");
			System.out.println(k);
		} catch (NumberFormatException e) {
			System.out.println("     ");
		}
		
		System.out.println(Integer.toBinaryString(123) + "B");
		System.out.println(Integer.toHexString(123) + "H");
		System.out.println(Integer.toOctalString(123) + "O");
	}
}