test.java

代码包括《Java语言与面向对象程序设计题解与实验指导》一书中 “习题解答”部分的所有程序的Java源代码和编译后生成的字节码或相应的HTML文件。 盘中的目录与书中的章节一致。

import java.util.*;

public class test
{
    public static void main(String args[])
    {
        int i = 6;
        String str = null;
        
        System.out.println("I know the number " + i);
        str = i + "I know the number ";
        System.out.println(str);
        str = "hello";
        if(str == "hello")
            System.out.println("match.");
        else
            System.out.println("no match.");
        Vector myVector = new Vector();
        myVector.add("Hello");
        System.out.println("第一个字母是：" + ((String)(myVector.get(0))).charAt(0));


    }
}

class supClass
{
    int supVariable = 0;
    
    supClass(int a)
    {
        supVariable = a;
    }
}

class subClass extends supClass
{
    int subVariable = 0;
    
    subClass(int a)
    {
        super(a);
        subVariable = a;
    }
}