18.04.25

• char类型
  
  • java 判断 char 是否为空格 和 空

11111

//  java 判断 char 是否为空格 和 空
    public static void main (String[] args) {
        String str = "abc abc";
        char [] ch = str.toCharArray();
        for (int i = 0;i<ch.length;i++) {
            if (Character.isSpace(ch[i]))
                System.out.println("ok");

        }
    }

    public static void main1 (String[] args) {
        char M = 'A';
        if (M != '\0') {
            System.out.println("字符串M不为空");
        }
        char [] N = new char[1];
        if (N[0] == '\0') {
            System.out.println("字符串N[0]为空");
        }
    }

• Map
  
  • Map 的put 和 putAll 的区别

Map<String,String> mode1 = new HashMap<String,String>();
mode.put("a","1");
mode.put("b","2");
System.out.println(mode); 

Map<String,String> mode2 = new HashMap<String,String>();
mode2.put("aa","11");
mode2.put("bb","22");
mode2.putAll(mode);
System.out.println(mode2); 

结果：
{a,1}，{b,2}
{a,1}，{b,2},{aa,11},{bb,22}

• 触发 button 按钮方法，及提交表单

$(function () {
        $("#updateForm").click(function() {
            var fform = $("#updateForm");
            fform.submit();
        });
    });