java 数组问题

package practice;

public class TestArrayCopy {

public static void main(String args []) {
    String[] s={"Mircosoft","IBM","Sun","Oracle","Apple"};
String[] sBak=new String[6];
    System.arraycopy(s,0,sBak,0,s.length);
    for(int i=0;i<sBak.length;i++){
        System.out.println(sBak[i]);
    }
    **int [][] intArray={(1,2),(1,2,3),(3,4)};**
    int [][] intArrayBak=new int [3][];
    System.arraycopy(intArray,0,intArrayBak,0,intArray.length);
    intArrayBak[2][1]=100;
    for(int i=0;i<intArray.length;i++)
    for(int j=0;j<intArray.length;j++){
        System.out.println(intArray[i][j]);
    }

}
}
代码加粗的地方为什么报错？