java 基本数据类型之间的比较

String str1 = "123";
		String str2 = "123";
		if(str1.equals(str2)){
			System.out.println("str1  和 str2 字符串相等！");
		}else{
			System.out.println("str1  和 str2 字符串不等！");
		}

Long l1 = new Long(100);
Long l2 = new Long(200);
if(l1.longValue()l2.longValue()){
	System.out.println("l1 > l2");
}else if(l1.longValue() == l2.longValue()){
	System.out.println("l1 == l2");
}

String beginTime = "2022-06-24 14:42:32";
		String endTime = "2021-06-25 14:42:32";
		SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		try {
			Date a = format.parse(beginTime);
			Date b = format.parse(endTime);
			boolean before = a.before(b);
			boolean after = a.after(b);
			System.out.println("开始时间在结束时间之前："+before);
			System.out.println("开始时间在结束时间之后："+after);
		} catch (ParseException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		float a=2.23f;
		float b=2.23f;
		System.out.println(a==b);
		//只能定义比较，计算后比较可能会有精度损失
		Float f1 = new Float("25.2");
		Float f2 = new Float("25.2000");
		int res = f1.compareTo(f2);
		if(res > 0) {
			System.out.println("f1 > f2");
		}else if(res < 0) {
			System.out.println("f1 < f2");
		}else {
			System.out.println("f1 = f2");
		}

		BigDecimal val1 = new BigDecimal(2.23);  
        BigDecimal val2 = new BigDecimal(2.2300);  
		if(val1.compareTo(val2) == 0) {
			System.out.println("val1==val2");
		}else {
			System.out.println("val1!=val2");
		}