java怎么动态的往一个字符串数组里加入字符串元素，

1.创建按一个新数组,新数组的长度比现在的大1个

2.将老数组的内容copy到新数组中

3.给新数组的最后一个元素赋值为 插入的字符串

4.删除老数组,(GC处理)

5,给你个例子,你看看

import java.util.Arrays

public class $

{

public static void main(String[] args)

{

String[] arr = { "1", "2" }

System.out.println(Arrays.deepToString(arr))

arr = insert(arr, "a")

System.out.println(Arrays.deepToString(arr))

arr = insert(arr, "b")

System.out.println(Arrays.deepToString(arr))

}

private static String[] insert(String[] arr, String str)

{

int size = arr.length

String[] tmp = new String[size + 1]

System.arraycopy(arr, 0, tmp, 0, size)

tmp[size] = str

return tmp

}

}

结果

[1, 2]

[1, 2, a]

[1, 2, a, b]

import java.util.Scanner

import java.util.InputMismatchException

public class saveInputToArr {

public static void main(String[] args) {

Scanner scan = null

try {

scan = new Scanner(System.in)

System.out.print( "请输入个数: " )

int inputNum = scan.nextInt()

if( inputNum <= 0 ) {

throw new Exception( "输入有误" )

}

System.out.println( "请输入数字: " )

int arr[] = new int[inputNum]

int num = 0

int count = 0

while( count <inputNum ) {

num = scan.nextInt()

arr[count] = num

count++

}

for( int i = 0i <arr.lengthi++ ) {

System.out.print( arr[i] + "  " )

}

} catch ( Exception e ) {

throw new InputMismatchException( "\u8f93\u5165\u6709\u8bef\u002c\u0020\u8bf7\u91cd\u65b0\u8f93\u5165" )

} finally {

try {

if ( scan != null ) {

scan.close()

}

} catch ( Exception e2 ) {

e2.printStackTrace()

}

}

}

}

运行结果为：

请输入个数: 2

请输入数字:99

123

99 123

扩展资料

Java从输入中读取一个数组

import java.util.Scanner

public class Main {

public static void main(String[] args) {

// TODO Auto-generated method stub

Scanner sc = new Scanner(System.in)

String str = sc.nextLine().toString()//用nextLine（）可以读取一整行，包括了空格，next（）却不能读取空格

String arr[] = str.split(" ")//拆分字符串成字符串数组

int a[] = new int[arr.length]

for(int j = 0j <a.lengthj++)

{

a[j] = Integer.parseInt(arr[j])

System.out.print(a[j] + " ")

}

}

}

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