一、基本转义字符
System.out.println("\"1122\"");
System.out.println("\'2233\'");
System.out.println("\\3344\\");
System.out.print("1122\n");
System.out.print("2233\n");
System.out.println("3*3=9\t3*4=12\t3*5=15");
System.out.println("4*3=12\t4*4=16\t4*5=20");