Question

java 关于字符串数组的赋值

String[] apart = ....... ;
String[] eye1 ;
下面的赋值是错误的对吧？
eye1[0]=apart[0];
eye1[1]=apart[1];
eye1[2]=apart[2];
eye1[3]=apart[3]；
那我该如何把apart[1]赋值给eye1[7]呢？

Answer 1

数组没有初始化，也没有声明长度，所以不能赋值。
String[] apart =new String[3];
String[] eye1=new String[3] ;
这样赋值只能赋到eye1[2]=apart [2]； 结果是NULL。int类型的话是0；
如何把apart[1]赋值给eye1[7]呢？
至少满足下面条件
String[] apart =new String[8];
String[] eye1=new String[1] ;
eye[1]=apart[7]；

Answer 2

String[] eye1 ;
这里你没定义数组长度，肯定不能赋值进去

应该写成：

String[] eye1 = new String[apart.length];

Answer 3

代码如下 请自己对照
public class PrintArr {

public static void main(String[] args) {
String [] a = {"aa","ab","ac"};
String [] b = {"ba","bb","bc"};

a[0] = b[2];

System.out.println(a[0]);
}
}

Answer 4

String [] a = {"1","2","3"};
String [] b = new String[a.length];
int i = 0;
for(String str : a)
{
b[i] = str;
System.out.println(b[i]);
i++;
}

Answer 5

String []apart={"1" ,"2", "3", "4", "5" ,"6", "7"}
String []eye1=new String[];
.
.
.
.
.
eye1[7]=apart[1];