java基础之杂七杂八

public class Tester {
    public static void main(String[] args) {
        Integer var1=new Integer(1);
        Integer var3=new Integer(1);
        System.out.println(var1==var3);
        Integer v=1;
        System.out.println(var1==v);
        Integer var2=var1;
        System.out.println(var2==var1);
        doSomething(var2);
        System.out.println(var1.intValue());
        System.out.println(var1==var2);
    }
    public static void doSomething(Integer integer){
        integer=new Integer(2);
    }
}

public class Example {
   String str= new String("good");
    char[] ch={'a','b','c'};
    public static void main(String[] args) {
        Example ex = new Example();
        ex.change(ex.str, ex.ch);
        System.out.print(ex.str+" and ");
        System.out.println(ex.ch);

    }
    public void change(String str,char ch[]){
        str="test ok";
        ch[0]='g';
    }
}