Long与Integer之间的转换

Integer a = 10;
Long b = a.longValue();

Long a = 10L;
Integer b = a.intValue();

String与Integer之间的转换

int number = 10;
String s2 = String.valueOf(number);

String s = "100";
int x = Integer.parseInt(s);

String[]与String之间的转换

String a = "111,222,333,444";
String[] b = a.split(",");

String[] a = new String[]{"111","222","333"};
String temp = Arrays.toString(a); //在执行此行代码的时候，会从第二个开始在每个元素前面加上空格，可参照Arrays.toString()方法，将空格replace掉即可。
String s = temp.substring(1,temp.length()-1);