Java

	
	
	@Test
	public void test1() {
		String str1 = "123";
//		int num = (int)str1; //错误的
		int num = Integer.parseInt(str1);//123
		
		String str2 = String.valueOf(num);//"123"
	}

String与char[]之间的转换 
	
	String-->char[]:调用String的toCharArray()
	char[]-->String:调用String的构造器
	 */

	@Test
	public void test2() {
		String str1 = "abc123";
		char[] charArray =str1.toCharArray();
//		for (int i = 0; i < charArray.length; i++) {
//			System.out.println(charArray[i]);
//		}
		System.out.println(Arrays.toString(charArray));
		
		String str2 = new String(charArray);
		System.out.println(str2);
	}

	@Test
	public void test3() {
		String str1 = "abc123你好";
		byte[] bytes = str1.getBytes();//使用默认的字符集，进行转换
		System.out.println(Arrays.toString(bytes));//[97, 98, 99, 49, 50, 51, -28, -67, -96, -27, -91, -67]
		System.out.println(new String(bytes));
		try {
			byte[] gbks = str1.getBytes("GBK");
			System.out.println(Arrays.toString(gbks));//[97, 98, 99, 49, 50, 51, -60, -29, -70, -61]
			String str2 = new String(gbks,"GBK");
			System.out.println(str2);//abc123你好
		} catch (UnsupportedEncodingException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		
	
		
	}