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Legal Studies如何在 Java 中將一個數組從另一個數組複製
我們先建立一個字串陣列 −
String[] arr = new String[] { "P","Q", "R", "S", "T"};現在，計算上面陣列的長度並建立一個具有相同長度的新陣列 −
int len = arr.length; String[] arr2 = new String[len];
讓我們將一個數組從另一個數組複製 −
System.arraycopy(arr, 0, arr2, 0, arr.length);
示例
public class Demo {
public static void main(String[] args) {
String[] arr = new String[] { "P","Q", "R", "S", "T"};
System.out.println("Initial array...");
for (int i = 0; i < arr.length; i++)
System.out.println(arr[i]);
int len = arr.length;
String[] arr2 = new String[len];
System.arraycopy(arr, 0, arr2, 0, arr.length);
System.out.println("New array...copied");
for (int i = 0; i < arr2.length; i++)
System.out.println(arr2[i]);
}
}輸出
Initial array... P Q R S T New array...copied P Q R S T
更新於：30-Jul-2019
333 次瀏覽
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