primitive2wrapper.java

疯狂Java讲义_源码(含Java设计模式CHM

/**
 * Description:
 * <br/>Copyright (C), 2005-2008, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee [e-mail]
 * @version  1.0
 */
public class Primitive2Wrapper
{
	public static void main(String[] args) 
	{
		boolean bl = true;
		//通过构造器把b1基本类型变量包装成包装类对象
		Boolean blObj = new Boolean(bl);
	
		int it = 5;
		//通过构造器把it基本类型变量包装成包装类对象
		Integer itObj = new Integer(it);
		//把一个字符串转换成Float对象
		Float fl = new Float("4.56");
		//把一个字符串转换成Boolean对象
		Boolean bObj = new Boolean("trUe");
		System.out.print("---------" + bObj);
		//下面程序运行时将出现java.lang.NumberFormatException异常
		//Long lObj = new Long("ddd");

		//取出Boolean对象里的boolean变量
		boolean bb = bObj.booleanValue();
		//取出Integer对象里的int变量
		int i = itObj.intValue();
		//取出Float对象里的float变量
		float f = fl.floatValue();
	}
}