JAVA数组的声明

/**
 * 报错：Multiple markers at this line
 * - Line breakpoint:ListTest [line: 18] - ListTest()
 * - Variable must provide either dimension expressions or an array initializer
 * int[] num1 = new int[];
 */
int[] num1 = new int[3];
/**
 * 报错：Variable must provide either dimension expressions or an array initializer
 * int[][] num2 = new int[][];
 */
/**
 * 报错：Cannot specify an array dimension after an empty dimension
 * int[][] num2 = new int[][3];
 */
int[][] num2 = new int[3][];