package java4;
import org.junit.Test;
/*
* 包装类的使用
* */
public class WrapperTest {
//基本数据类型转换为对应的包装类
//调用包装类的构造器
@Test
public void test1(){
int num1 = 10;
Integer in1 = new Integer(num1);
System.out.println(in1.toString());
Integer in2 = new Integer("123");
System.out.println(in2);
Float f1 = new Float(12.3f);
Float f2 = new Float("12.3f");
System.out.println(f1);
System.out.println(f2);
Boolean b1 = new Boolean(true);
Boolean b2 = new Boolean("true");
Boolean b3 = new Boolean("true123"); //false
System.out.println(b3);
Order order = new Order();
System.out.println(order.b4);
System.out.println(order.b5);
}
/*
* 包装类转换为基本数据类型
* 调用包装类的xxxValue()
* */
@Test
public void test2(){
Integer in1 = new Integer(12);
int i1 = in1.intValue();
System.out.println(i1 + 10);
}
}
class Order{
boolean b4;
Boolean b5;
}
