A *a2=new

A *a2=new 关于java的继承问题?A1、A2分别是具体类A的子类,A3为A1的子类,A1、A2之间的关系为平行类,下面程序片段那些正确?A a=new A();a=new A1();a=new A2();a=new A2();A1 a1=new A3();A3 a3=a1;A2 a2=new A1();a3=new A2(); A a2=new A(a2);是什么意思为了更详细再写一遍A a2=new A(a2);源码是：class A{String name;public A(string x){name = x;}public void func(){System.out.println(“func1 of ”+name+is calling);}public void func2(){A a2=new A(a2);a2 A *p= new =IF(COUNTIF($A$1:A2,A2)>0,COUNTIF($A$1:A2,A2)) =IF(COUNTIF($A$1:A2,A2)>0,COUNTIF($A$1:A2,A2)) 设|A|是三阶矩阵,A=(a1,a2,a3)则|A|=?A.|a1-a2,a2-a3,a3-a1| B.|a1-a2,a2-a3,a3-a1|C.|a1+2a2,a3,a1+a2| D.|a1-a3,a2+a3,a1+a2| a new year,new 已知a2-a-6=0,则a2-2(a2-a+3)-1/2(a2-a-4)-a 这个符号错误是什么情况public class ArrayTest{public static void main(String[] args){int[] a = new int[]{3,4,5,6};int[] a2 = new int[]{3,4,5,6};System.out.println( Arrays.equals(a,a2));int[] b = Arrays.copyof(a ,6);System.out.println( Ar （a2-4/a2-4a+3）×（a-3/a2+3a+2=? This selection does not support run mode我的程序是这样的class A {String name;public A(String x){name=x;}public void func1(){System.out.println(func1 of +name+is calling);}public void func2(){A a2=new A(a2);a2.func1();}}class TestA{publi a2-3a+1=0求a2/a4+1 =IF(A2>90,A ,IF(A2>80,B ,C )) “=IF(A2>90,A,IF(A2>80,B,C))”, a2+a=2,求a3+2a2-3 已知,a2+a-1=0,求(a3+2a2-6)÷(a2+a)的值 已知a2+a-1=0,求分式a3+2a2-6/a2+a的值