Java1.7新特性
package com.anubis.test;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;
public class TestJDK7 {
public static void main(String[] args) throws FileNotFoundException,
IOException {
// switch string
String key = "dept";
switch (key) {
case "dept":
System.out.println("dept....");
break;
case "person":
System.out.println("person...");
break;
default:
break;
}
// 直接声明2进制数
int x = 0b1010;
System.out.println(x);
// 下划线数字
int y = 1_000_000;
System.out.println(y);
// twr 字节流
try (FileInputStream fis = new FileInputStream("d:/test.dmp")) {
byte[] buffer = new byte[100];
int count = 0;
System.out.println("字节流:");
while ((count = fis.read(buffer)) != -1) {
System.out.println(count);
System.out.println(new String(buffer, 0, count));
}
System.out.println();
}
// twr 字符流
try (FileReader fr = new FileReader("d:/test.dmp")) {
char[] buffer = new char[100];
int count = 0;
System.out.println("字符流");
while ((count = fr.read(buffer)) != -1) {
System.out.println(count);
System.out.println(new String(buffer, 0, count));
}
System.out.println();
}
// twr使用,注意单个声明(字符流-->字节流)
try (FileInputStream fis = new FileInputStream("d:/test.dmp");
InputStreamReader is = new InputStreamReader(fis);
BufferedReader br = new BufferedReader(is)) {
String temp = null;
while ((temp = br.readLine()) != null) {
System.out.println(temp);
}
}
// 钻石语法,自动泛型
Map map = new HashMap<>();
}
}