Java的常用包之二

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class StringTest
...{
    public static void change(int x,int y)
    ...{
        x=x+y;
        y=x-y;
        x=x-y;
    }
    public static void change(int[] num)
    ...{
        num[0]=num[0]+num[1];
        num[1]=num[0]-num[1];
        num[0]=num[0]-num[1];
    }
    public static void change(Point pt)
    ...{
        pt.x=pt.x+pt.y;
        pt.y=pt.x-pt.y;
        pt.x=pt.x-pt.y;
    }
    
    public static void main(String[] args)
    ...{
        /**//*int x=3;
        int y=4;
        change(x,y);
        System.out.println("x="+x+","+"y="+y);*/
        /**//*int[] num=new int[]{3,4};
        change(num);
        System.out.println("x="+num[0]+","+"y="+num[1]);*/
        /**//*Point pt=new Point();
        pt.x=3;
        pt.y=4;
        change(pt);
        //System.out.println("x="+pt.x+","+"y="+pt.y);
        System.out.println(pt);*/
        //System.out.println(args[0]);
        /**//*if(args.length>0)
        {
            for(int i=0;i<args.length;i++)
            {
                System.out.println(args[i]);
            }
        }*/
        /**//*String str1=new String("abc");
        String str2=new String("abc");
        String str3=str1;*/
        /**//*if(str1==str2)
        {
            System.out.println("str1==str2");
        }
        else
        {
            System.out.println("str1!=str2");
        }*/
        /**//*if(str1==str3)
        {
            System.out.println("str1==str3");
        }
        else
        {
            System.out.println("str1!=str3");
        }*/
        /**//*if(str1.equals(str2))
        {
            System.out.println("str1 equals str2");
        }
        else
        {
            System.out.println("str1 not equals str2");
        }*/
        /**//*int i=3;
        float f=1.5f;
        char ch='f';
        boolean b=false;
        //System.out.println(str1+i+f+ch+b);
        StringBuffer sb=new StringBuffer();
        sb.append(str1).append(i).append(f).append(ch).append(b);
        //System.out.println(sb.toString());
        sb.delete(4,8);
        sb.insert(4,"mybole");
        System.out.println(sb);*/
        /**//*int[] num=new int[3];
        for(int i=0;i<num.length;i++)
        {
            System.out.println(num[i]);
        }
        num=null;*/
        /**//*Student[] students;
        students=new Student[3];
        for(int i=0;i<students.length;i++)
        {
            System.out.println(students[i]);
        }*/
        Professor p=new Professor("wangwu",50);
        Student s1=new Student("zhangsan",18,p);
        Student s2=(Student)s1.clone();
        /**//*s2.name="lisi";
        s2.age=20;*/
        s2.p.name="lisi";
        s2.p.age=30;
        //System.out.println("name="+s1.name+","+"age="+s1.age);
        System.out.println("name="+s1.p.name+","+"age="+s1.p.age);
    }
}

class Professor implements Cloneable
...{
    String name;
    int age;
    Professor(String name,int age)
    ...{
        this.name=name;
        this.age=age;
    }
    public Object clone()
    ...{
        Object o=null;
        try
        ...{
            o=super.clone();
        }
        catch(CloneNotSupportedException e)
        ...{
            System.out.println(e.toString());
        }
        return o;
    }
}
class Student implements Cloneable
...{
    String name;
    int age;
    Professor p;
    Student(String name,int age,Professor p)
    ...{
        this.name=name;
        this.age=age;
        this.p=p;
    }
    public Object clone()
    ...{
        //Object o=null;
        Student o=null;
        try
        ...{
            o=(Student)super.clone();
        }
        catch(CloneNotSupportedException e)
        ...{
            System.out.println(e.toString());
        }
        o.p=(Professor)p.clone();
        return o;
    }
}
class Point
...{
    int x,y;
    public String toString()
    ...{
        return "x="+x+","+"y="+y;
    }
}