1,equals

@Test    public void test_equal(){        String a="1";        int b=1;        boolean result=a.equals(b);        System.out.println(result);    }

原因:equals 比较时自动把转化为包装类型了

@Test    public void test_equal(){        String a="1";        int b=1;        boolean result=a.equals(String.valueOf(b));        System.out.println(result);    }

2,包装类型

@Test    public void test_equal2(){        Long a=229L;        Long b=229L;        System.out.println((a==b));    }

运行结果:false

@Test    public void test_equal2(){        Long a=29L;        Long b=29L;        System.out.println((a==b));    }

运行结果为:true

@Test    public void test_equal2(){        Long a=229L;        Long b=229L;        System.out.println((a.intValue()==b.intValue()));    }