JAVA包装类和基本数据类型------JAVA入门基础教程

public class WrapperTest
{
    public static void main(String[] args)
    {
        int i1 = 10;
        Integer i11 = new Integer(i1);
        System.out.println(i11);

        float f1 = 12.3F;
        f1 = 32.2F;
        Float ff1 = new Float(f1);
        System.out.println(ff1);

        String s1 = "32.1";
        Float ff2 = new Float(s1);
        System.out.println(ff2);

        boolean b1 = true;
        Boolean bb1 = new Boolean(b1);
        System.out.println(bb1);

        String s2 = "TRue";
        Boolean bb2 = new Boolean(s2);
        System.out.println(bb2);

        String s3 = "dasdcvz";
        Boolean bb3 = new Boolean(s3);
        System.out.println(bb3);

        int i2 = 10;
        Integer ii2 = Integer.valueOf(i2);
        Boolean b2 = Boolean.valueOf(true);
        Float f2 = Float.valueOf(12.3F);

        Integer ir1 = new Integer(10);
        int iu = ir1.intValue();
        System.out.println(iu);

        int ire = 12;
        Integer po = ire;
        int up = 0;
        up = po;
        System.out.println(up);
    }
}

public class WrapperTest
{
    public static void main(String[] args)
    {
        int i1 = 10;
        Integer i11 = new Integer(i1);
        System.out.println(i11);

        float f1 = 12.3F;
        f1 = 32.2F;
        Float ff1 = new Float(f1);
        System.out.println(ff1);

        String s1 = "32.1";
        Float ff2 = new Float(s1);
        System.out.println(ff2);

        boolean b1 = true;
        Boolean bb1 = new Boolean(b1);
        System.out.println(bb1);

        String s2 = "TRue";
        Boolean bb2 = new Boolean(s2);
        System.out.println(bb2);

        String s3 = "dasdcvz";
        Boolean bb3 = new Boolean(s3);
        System.out.println(bb3);

        int i2 = 10;
        Integer ii2 = Integer.valueOf(i2);
        Boolean b2 = Boolean.valueOf(true);
        Float f2 = Float.valueOf(12.3F);

        Integer ir1 = new Integer(10);
        int iu = ir1.intValue();
        System.out.println(iu);

        int ire = 12;
        Integer po = ire;
        int up = 0;
        up = po;
        System.out.println(up);
    }
}文章来源地址https://www.toymoban.com/news/detail-433054.html

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