package FirstJava;
public class array{
public static void main(String[] args) {
//原数组
int [] oldArray = new int []{11,22,33,44};
//扩容步骤1：创建比原数组更大的数组
int [] newArray = new int [ oldArray.length *2];
//扩容步骤2，将原数组的元素，依次复制到新数组中
//写个循环，将old下标的值赋给new里
for(int i = 0;i < oldArray.length ; i++){
newArray[i]=oldArray[i];
}
//遍历访问
for(int i = 0;i < newArray.length; i++){
System.out.print(newArray[i]);
}
System.out.println();
}
}
package FirstJava;
public class array {
public static void main(String[] args) {
//原数组
int [] oldArray = new int []{11,22,33,44,55};
//扩容步骤1：创建比原数组更大的新数组
int [] newArray = new int [ oldArray.length * 2 ];
//扩容步骤2：将原数组的元素，依次复制到新数组中
System.arraycopy(oldArray,0,newArray,0,oldArray.length);
//遍历访问
for(int i = 0 ; i <= newArray.length ; i++) {
System.out.println(newArray[i] + "t");
}
System.out.println();
}
}
//第三种方法
package FirstJava;
//引入包
import java.util.Arrays;
public class array {
public static void main(String[] args) {
int [] oldArray = new int []{11,22,33,44,55};
int [] newArray = Arrays.copyOf(oldArray,oldArray.length * 2);
//遍历访问
for(int i = 0 ; i <=5 ; i++) {
System.out.println(newArray[i]);
}
}
}
