java包装类注意项总结

package test;

public class test11 {
    public static void main(String[] args) {
        //装箱
        int numl = 10;
        Integer num2 = new Integer(numl);
        System.out.println(num2);

        //拆箱
        int num3 = num2.intValue();
        System.out.println(num3);
    }

}

package ch0504.case02;

public class IntFuncsExam {
    public static void main(String[] args) {
        System.out.println("二进制显示8:"+Integer.toBinaryString(123));
        System.out.println("十六进制显示123:"+Integer.toHexString(123));
        System.out.println("八进制显示123:"+Integer.toOctalString(123));
        System.out.println(Double.valueOf("12.99") instanceof  Double);

    }
}