JDK10中的局部变量类型推断var

//根据推断为 字符串串类型
var strVar = "springboot";
System.out.println(strVar instanceof String);
 
//根据10L 推断long 类型
var longVar = 10 L;
 
//根据 true推断 boolean 类型
var flag = true;
//var flag = Boolean.valueOf("true");
//System.out.println(flag instanceof Boolean);
 
// 推断 ArrayList<String>
var listVar = new ArrayList < String > ();
System.out.println(listVar instanceof ArrayList);
 
// 推断 Stream<String>
var streamVar = Stream.of("aa", "bb", "cc");
System.out.println(streamVar instanceof Stream);
if (flag) {
  System.out.println("这个是 flag 变量量，值为true");
}
for (var i = 0; i < 10; i++) {
  System.out.println(i);
}
try (var input = new FileInputStream("validation.txt")) {}

var str = "ABC"; //根据推断为 字符串类型
var l = 10L;//根据10L 推断long 类型
var flag = true;//根据 true推断 boolean 类型
var flag1 = 1;//这里会推断boolean类型。0表示false 非0表示true
var list = new ArrayList<String>(); // 推断 ArrayList<String>
var stream = list.stream();     // 推断 Stream<String>

String str = "ABC";
long l = 10L;
boolean flag = true;
int flag1 = true;
ArrayList<String> list = new ArrayList();
Stream<String> stream = list.stream();