包装类

package WrapperTest;


import org.junit.Test;

/**
 * @author liu$
 * @version 1.0
 * @description: java提供了八种包装类，使得基本数据类型具有类的特征 int-Interger
 * @date 2022.10.15$ $
 */
public class wrapp0 {
    //包装类-->基本数据类型：调用包装类的xxxValue()
    public void test2(){
        Integer in1 = new Integer(12) ;
        int i1 = in1.intValue() ;
        System.out.println(in1+1);
        Float f1 = new Float(13.4) ;
        float f2 = f1.floatValue();
        System.out.println(f2+1);

}


    public void test(){
        int num1 =10 ;
        Integer in1 = new Integer(num1) ;
        System.out.println(in1.toString());
        Integer in2 = new Integer("123") ;
        System.out.println(in2.toString());
        //报异常
    //Integer in3 = new Integer("123abc") ;
    //System.out.println(in3.toString());
        Boolean b1 = new Boolean(true) ;
        Boolean b2 = new Boolean("True") ;
        System.out.println(b2);
        Boolean b3 = new Boolean("true123") ;
        System.out.println(b3);//false
        Order order = new Order() ;
        System.out.println(order.isMale);
        System.out.println(order.isFemale); //null此时为一个对象，初始值为null
    }
}
class  Order {
    boolean isMale;
    Boolean isFemale;
}