6.8 数组类库支持

demo1 java.util.Arrays.sort() 实现排序

class ArrayUtil {

    public static void printArray(int temp []){
        for(int x = 0;x < temp.length;x++){
            System.out.print(temp[x] + ",");
        }
    }
}


public class HelloWorld {
    public static void main(String[] args){

        int data [] = new int [] {13,2,133,43,25,46};
        ArrayUtil arrayUtil = new ArrayUtil();
        java.util.Arrays.sort(data);// 排序,java自带排序方法
        arrayUtil.printArray(data);
    }


}

demo2 System.arraycopy , 数组A 选择部分内容，拷贝到数组B

class ArrayUtil {

    public static void printArray(int temp []){
        for(int x = 0;x < temp.length;x++){
            System.out.print(temp[x] + ",");
        }
    }
}

public class HelloWorld {
    public static void main(String[] args){

        int dataA[] = new int[] {1,2,3,4,5,6,7,8,9};
        int dataB[] = new int[] {11,22,33,44,55,66,77,88,99};

        System.arraycopy(dataA,5,dataB,3,3);// 系统自带数组拷贝;

        ArrayUtil arrayUtil = new ArrayUtil();
        arrayUtil.printArray(dataB);//11,22,33,6,7,8,77,88,99,
    }

}