首先定义两个数组，这边以int数组为例

int[] arrayList={9,5,3,2,0,4};

int[] arrayList2={1,6,8,7};

方法一、ArrayUtils.addAll()方法，引入包：org.apache.commons.lang3.ArrayUtils;

int[] tempArrayList = ArrayUtils.addAll(arrayList,arrayList2);

String tempStr = Arrays.toString(tempArrayList);  //将数组转化为字符串

方法二、System.arraycopy()方法

System.arraycopy(源数组，源数组起始位置，目标数组，目标数组起始位置，需要赋值数组元素长度);

int[] tempArrayList = new int[arrayList.length+arrayList2.length];

System.arraycopy(arrayList,0,tempArrayList,0,arrayList.length);

System.arraycopy(arrayList2,0,tempArrayList,arrayList.length,arrayList2.length);

String tempStr = Arrays.toString(tempArrayList); //将数组转化为字符串

方法三、Arrays.copyOf()方法

Arrays.copyOf(要复制的数组，要返回副本数组的长度);

int[] tempArrayList = Arrays.copyOf(arrayList,arrayList.length+arrayList2.length);

System.arraycopy(arrayList2,0,tempArrayList,arrayList.length,arrayList2.length);

String tempStr = Arrays.toString(tempArrayList); //将数组转化为字符串

方法四、Array.newInstance()方法

Array.newInstance(新数组的组件类型的Class对象，新数组的长度);

int[] tempArrayList = (int[])Array.newInstance(arrayList.getClass().getComponentType(),arrayList.length+arrayList2.length);

System.arraycopy(arrayList,0,tempArrayList,0,arrayList.length);

System.arraycopy(arrayList2,0,tempArrayList,arrayList.length,arrayList2.length);

String tempStr = Arrays.toString(tempArrayList); //将数组转化为字符串

代码展示：

public static void main(String[] args) {
		
		int[] arrayList={9,5,3,2,0,4};
		int[] arrayList2={1,6,8,7};
		
		/*//方法一、ArrayUtils.addAll(数组1，数组2）；
		 * //ArrayUtils.addAll()方法，引入包：org.apache.commons.lang3.ArrayUtils;
		 * int[] tempArrayList = ArrayUtils.addAll(arrayList,arrayList2);
		String tempStr = Arrays.toString(tempArrayList); //将数组转化为字符串*/
		
		
		/*//方法二、System.arraycopy()方法
		//System.arraycopy(源数组，源数组起始位置，目标数组，目标数组起始位置，需要赋值数组元素长度);
		int[] tempArrayList = new int[arrayList.length+arrayList2.length];
		System.arraycopy(arrayList,0,tempArrayList,0,arrayList.length);
		System.arraycopy(arrayList2,0,tempArrayList,arrayList.length,arrayList2.length);
		String tempStr = Arrays.toString(tempArrayList); //将数组转化为字符串*/		
		
		
		
		/*//方法三、Arrays.copyOf()方法
		//Arrays.copyOf(要复制的数组，要返回副本数组的长度);
		int[] tempArrayList = Arrays.copyOf(arrayList,arrayList.length+arrayList2.length);
		System.arraycopy(arrayList2,0,tempArrayList,arrayList.length,arrayList2.length);
		String tempStr = Arrays.toString(tempArrayList); //将数组转化为字符串*/
		
		//方法四、Array.newInstance()方法
		//Array.newInstance(新数组的组件类型的Class对象，新数组的长度);
		int[] tempArrayList = (int[])Array.newInstance(arrayList.getClass().getComponentType(),arrayList.length+arrayList2.length);
		System.arraycopy(arrayList,0,tempArrayList,0,arrayList.length);
		System.arraycopy(arrayList2,0,tempArrayList,arrayList.length,arrayList2.length);
		String tempStr = Arrays.toString(tempArrayList); //将数组转化为字符串

		System.out.println(tempStr);
	}