实体与标识符的理解 0125

通过悟空理解实体与标识

图片素材

问题

它来自哪一部作品
它有哪些名称（称呼）

关注点

肉体
名称
名称与肉体的关联

结论

可以用名称来标记实体

通过象棋理解实体与标识

图片素材

问题

可见的实体有哪些
这些实体分别都叫什么名字

小结

实体与名字是有关联的

新名词

标识符

通过游戏理解实体与标识

图片素材

问题

说出图中的实体与标识

不同体系实体不同

在人类的免疫系统中

程序世界中的实体与标识

#mermaid-svg-brRdcw06nOMjEdAk .label{font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family);fill:#333;color:#333}#mermaid-svg-brRdcw06nOMjEdAk .label text{fill:#333}#mermaid-svg-brRdcw06nOMjEdAk .node rect,#mermaid-svg-brRdcw06nOMjEdAk .node circle,#mermaid-svg-brRdcw06nOMjEdAk .node ellipse,#mermaid-svg-brRdcw06nOMjEdAk .node polygon,#mermaid-svg-brRdcw06nOMjEdAk .node path{fill:#ECECFF;stroke:#9370db;stroke-width:1px}#mermaid-svg-brRdcw06nOMjEdAk .node .label{text-align:center;fill:#333}#mermaid-svg-brRdcw06nOMjEdAk .node.clickable{cursor:pointer}#mermaid-svg-brRdcw06nOMjEdAk .arrowheadPath{fill:#333}#mermaid-svg-brRdcw06nOMjEdAk .edgePath .path{stroke:#333;stroke-width:1.5px}#mermaid-svg-brRdcw06nOMjEdAk .flowchart-link{stroke:#333;fill:none}#mermaid-svg-brRdcw06nOMjEdAk .edgeLabel{background-color:#e8e8e8;text-align:center}#mermaid-svg-brRdcw06nOMjEdAk .edgeLabel rect{opacity:0.9}#mermaid-svg-brRdcw06nOMjEdAk .edgeLabel span{color:#333}#mermaid-svg-brRdcw06nOMjEdAk .cluster rect{fill:#ffffde;stroke:#aa3;stroke-width:1px}#mermaid-svg-brRdcw06nOMjEdAk .cluster text{fill:#333}#mermaid-svg-brRdcw06nOMjEdAk div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family);font-size:12px;background:#ffffde;border:1px solid #aa3;border-radius:2px;pointer-events:none;z-index:100}#mermaid-svg-brRdcw06nOMjEdAk .actor{stroke:#ccf;fill:#ECECFF}#mermaid-svg-brRdcw06nOMjEdAk text.actor>tspan{fill:#000;stroke:none}#mermaid-svg-brRdcw06nOMjEdAk .actor-line{stroke:grey}#mermaid-svg-brRdcw06nOMjEdAk .messageLine0{stroke-width:1.5;stroke-dasharray:none;stroke:#333}#mermaid-svg-brRdcw06nOMjEdAk .messageLine1{stroke-width:1.5;stroke-dasharray:2, 2;stroke:#333}#mermaid-svg-brRdcw06nOMjEdAk #arrowhead path{fill:#333;stroke:#333}#mermaid-svg-brRdcw06nOMjEdAk .sequenceNumber{fill:#fff}#mermaid-svg-brRdcw06nOMjEdAk #sequencenumber{fill:#333}#mermaid-svg-brRdcw06nOMjEdAk #crosshead path{fill:#333;stroke:#333}#mermaid-svg-brRdcw06nOMjEdAk .messageText{fill:#333;stroke:#333}#mermaid-svg-brRdcw06nOMjEdAk .labelBox{stroke:#ccf;fill:#ECECFF}#mermaid-svg-brRdcw06nOMjEdAk .labelText,#mermaid-svg-brRdcw06nOMjEdAk .labelText>tspan{fill:#000;stroke:none}#mermaid-svg-brRdcw06nOMjEdAk .loopText,#mermaid-svg-brRdcw06nOMjEdAk .loopText>tspan{fill:#000;stroke:none}#mermaid-svg-brRdcw06nOMjEdAk .loopLine{stroke-width:2px;stroke-dasharray:2, 2;stroke:#ccf;fill:#ccf}#mermaid-svg-brRdcw06nOMjEdAk .note{stroke:#aa3;fill:#fff5ad}#mermaid-svg-brRdcw06nOMjEdAk .noteText,#mermaid-svg-brRdcw06nOMjEdAk .noteText>tspan{fill:#000;stroke:none}#mermaid-svg-brRdcw06nOMjEdAk .activation0{fill:#f4f4f4;stroke:#666}#mermaid-svg-brRdcw06nOMjEdAk .activation1{fill:#f4f4f4;stroke:#666}#mermaid-svg-brRdcw06nOMjEdAk .activation2{fill:#f4f4f4;stroke:#666}#mermaid-svg-brRdcw06nOMjEdAk .mermaid-main-font{font-family:"trebuchet ms", verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-brRdcw06nOMjEdAk .section{stroke:none;opacity:0.2}#mermaid-svg-brRdcw06nOMjEdAk .section0{fill:rgba(102,102,255,0.49)}#mermaid-svg-brRdcw06nOMjEdAk .section2{fill:#fff400}#mermaid-svg-brRdcw06nOMjEdAk .section1,#mermaid-svg-brRdcw06nOMjEdAk .section3{fill:#fff;opacity:0.2}#mermaid-svg-brRdcw06nOMjEdAk .sectionTitle0{fill:#333}#mermaid-svg-brRdcw06nOMjEdAk .sectionTitle1{fill:#333}#mermaid-svg-brRdcw06nOMjEdAk .sectionTitle2{fill:#333}#mermaid-svg-brRdcw06nOMjEdAk .sectionTitle3{fill:#333}#mermaid-svg-brRdcw06nOMjEdAk .sectionTitle{text-anchor:start;font-size:11px;text-height:14px;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-brRdcw06nOMjEdAk .grid .tick{stroke:#d3d3d3;opacity:0.8;shape-rendering:crispEdges}#mermaid-svg-brRdcw06nOMjEdAk .grid .tick text{font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-brRdcw06nOMjEdAk .grid path{stroke-width:0}#mermaid-svg-brRdcw06nOMjEdAk .today{fill:none;stroke:red;stroke-width:2px}#mermaid-svg-brRdcw06nOMjEdAk .task{stroke-width:2}#mermaid-svg-brRdcw06nOMjEdAk .taskText{text-anchor:middle;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-brRdcw06nOMjEdAk .taskText:not([font-size]){font-size:11px}#mermaid-svg-brRdcw06nOMjEdAk .taskTextOutsideRight{fill:#000;text-anchor:start;font-size:11px;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-brRdcw06nOMjEdAk .taskTextOutsideLeft{fill:#000;text-anchor:end;font-size:11px}#mermaid-svg-brRdcw06nOMjEdAk .task.clickable{cursor:pointer}#mermaid-svg-brRdcw06nOMjEdAk .taskText.clickable{cursor:pointer;fill:#003163 !important;font-weight:bold}#mermaid-svg-brRdcw06nOMjEdAk .taskTextOutsideLeft.clickable{cursor:pointer;fill:#003163 !important;font-weight:bold}#mermaid-svg-brRdcw06nOMjEdAk .taskTextOutsideRight.clickable{cursor:pointer;fill:#003163 !important;font-weight:bold}#mermaid-svg-brRdcw06nOMjEdAk .taskText0,#mermaid-svg-brRdcw06nOMjEdAk .taskText1,#mermaid-svg-brRdcw06nOMjEdAk .taskText2,#mermaid-svg-brRdcw06nOMjEdAk .taskText3{fill:#fff}#mermaid-svg-brRdcw06nOMjEdAk .task0,#mermaid-svg-brRdcw06nOMjEdAk .task1,#mermaid-svg-brRdcw06nOMjEdAk .task2,#mermaid-svg-brRdcw06nOMjEdAk .task3{fill:#8a90dd;stroke:#534fbc}#mermaid-svg-brRdcw06nOMjEdAk .taskTextOutside0,#mermaid-svg-brRdcw06nOMjEdAk .taskTextOutside2{fill:#000}#mermaid-svg-brRdcw06nOMjEdAk .taskTextOutside1,#mermaid-svg-brRdcw06nOMjEdAk .taskTextOutside3{fill:#000}#mermaid-svg-brRdcw06nOMjEdAk .active0,#mermaid-svg-brRdcw06nOMjEdAk .active1,#mermaid-svg-brRdcw06nOMjEdAk .active2,#mermaid-svg-brRdcw06nOMjEdAk .active3{fill:#bfc7ff;stroke:#534fbc}#mermaid-svg-brRdcw06nOMjEdAk .activeText0,#mermaid-svg-brRdcw06nOMjEdAk .activeText1,#mermaid-svg-brRdcw06nOMjEdAk .activeText2,#mermaid-svg-brRdcw06nOMjEdAk .activeText3{fill:#000 !important}#mermaid-svg-brRdcw06nOMjEdAk .done0,#mermaid-svg-brRdcw06nOMjEdAk .done1,#mermaid-svg-brRdcw06nOMjEdAk .done2,#mermaid-svg-brRdcw06nOMjEdAk .done3{stroke:grey;fill:#d3d3d3;stroke-width:2}#mermaid-svg-brRdcw06nOMjEdAk .doneText0,#mermaid-svg-brRdcw06nOMjEdAk .doneText1,#mermaid-svg-brRdcw06nOMjEdAk .doneText2,#mermaid-svg-brRdcw06nOMjEdAk .doneText3{fill:#000 !important}#mermaid-svg-brRdcw06nOMjEdAk .crit0,#mermaid-svg-brRdcw06nOMjEdAk .crit1,#mermaid-svg-brRdcw06nOMjEdAk .crit2,#mermaid-svg-brRdcw06nOMjEdAk .crit3{stroke:#f88;fill:red;stroke-width:2}#mermaid-svg-brRdcw06nOMjEdAk .activeCrit0,#mermaid-svg-brRdcw06nOMjEdAk .activeCrit1,#mermaid-svg-brRdcw06nOMjEdAk .activeCrit2,#mermaid-svg-brRdcw06nOMjEdAk .activeCrit3{stroke:#f88;fill:#bfc7ff;stroke-width:2}#mermaid-svg-brRdcw06nOMjEdAk .doneCrit0,#mermaid-svg-brRdcw06nOMjEdAk .doneCrit1,#mermaid-svg-brRdcw06nOMjEdAk .doneCrit2,#mermaid-svg-brRdcw06nOMjEdAk .doneCrit3{stroke:#f88;fill:#d3d3d3;stroke-width:2;cursor:pointer;shape-rendering:crispEdges}#mermaid-svg-brRdcw06nOMjEdAk .milestone{transform:rotate(45deg) scale(0.8, 0.8)}#mermaid-svg-brRdcw06nOMjEdAk .milestoneText{font-style:italic}#mermaid-svg-brRdcw06nOMjEdAk .doneCritText0,#mermaid-svg-brRdcw06nOMjEdAk .doneCritText1,#mermaid-svg-brRdcw06nOMjEdAk .doneCritText2,#mermaid-svg-brRdcw06nOMjEdAk .doneCritText3{fill:#000 !important}#mermaid-svg-brRdcw06nOMjEdAk .activeCritText0,#mermaid-svg-brRdcw06nOMjEdAk .activeCritText1,#mermaid-svg-brRdcw06nOMjEdAk .activeCritText2,#mermaid-svg-brRdcw06nOMjEdAk .activeCritText3{fill:#000 !important}#mermaid-svg-brRdcw06nOMjEdAk .titleText{text-anchor:middle;font-size:18px;fill:#000;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-brRdcw06nOMjEdAk g.classGroup text{fill:#9370db;stroke:none;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family);font-size:10px}#mermaid-svg-brRdcw06nOMjEdAk g.classGroup text .title{font-weight:bolder}#mermaid-svg-brRdcw06nOMjEdAk g.clickable{cursor:pointer}#mermaid-svg-brRdcw06nOMjEdAk g.classGroup rect{fill:#ECECFF;stroke:#9370db}#mermaid-svg-brRdcw06nOMjEdAk g.classGroup line{stroke:#9370db;stroke-width:1}#mermaid-svg-brRdcw06nOMjEdAk .classLabel .box{stroke:none;stroke-width:0;fill:#ECECFF;opacity:0.5}#mermaid-svg-brRdcw06nOMjEdAk .classLabel .label{fill:#9370db;font-size:10px}#mermaid-svg-brRdcw06nOMjEdAk .relation{stroke:#9370db;stroke-width:1;fill:none}#mermaid-svg-brRdcw06nOMjEdAk .dashed-line{stroke-dasharray:3}#mermaid-svg-brRdcw06nOMjEdAk #compositionStart{fill:#9370db;stroke:#9370db;stroke-width:1}#mermaid-svg-brRdcw06nOMjEdAk #compositionEnd{fill:#9370db;stroke:#9370db;stroke-width:1}#mermaid-svg-brRdcw06nOMjEdAk #aggregationStart{fill:#ECECFF;stroke:#9370db;stroke-width:1}#mermaid-svg-brRdcw06nOMjEdAk #aggregationEnd{fill:#ECECFF;stroke:#9370db;stroke-width:1}#mermaid-svg-brRdcw06nOMjEdAk #dependencyStart{fill:#9370db;stroke:#9370db;stroke-width:1}#mermaid-svg-brRdcw06nOMjEdAk #dependencyEnd{fill:#9370db;stroke:#9370db;stroke-width:1}#mermaid-svg-brRdcw06nOMjEdAk #extensionStart{fill:#9370db;stroke:#9370db;stroke-width:1}#mermaid-svg-brRdcw06nOMjEdAk #extensionEnd{fill:#9370db;stroke:#9370db;stroke-width:1}#mermaid-svg-brRdcw06nOMjEdAk .commit-id,#mermaid-svg-brRdcw06nOMjEdAk .commit-msg,#mermaid-svg-brRdcw06nOMjEdAk .branch-label{fill:lightgrey;color:lightgrey;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-brRdcw06nOMjEdAk .pieTitleText{text-anchor:middle;font-size:25px;fill:#000;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-brRdcw06nOMjEdAk .slice{font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-brRdcw06nOMjEdAk g.stateGroup text{fill:#9370db;stroke:none;font-size:10px;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-brRdcw06nOMjEdAk g.stateGroup text{fill:#9370db;fill:#333;stroke:none;font-size:10px}#mermaid-svg-brRdcw06nOMjEdAk g.statediagram-cluster .cluster-label text{fill:#333}#mermaid-svg-brRdcw06nOMjEdAk g.stateGroup .state-title{font-weight:bolder;fill:#000}#mermaid-svg-brRdcw06nOMjEdAk g.stateGroup rect{fill:#ECECFF;stroke:#9370db}#mermaid-svg-brRdcw06nOMjEdAk g.stateGroup line{stroke:#9370db;stroke-width:1}#mermaid-svg-brRdcw06nOMjEdAk .transition{stroke:#9370db;stroke-width:1;fill:none}#mermaid-svg-brRdcw06nOMjEdAk .stateGroup .composit{fill:white;border-bottom:1px}#mermaid-svg-brRdcw06nOMjEdAk .stateGroup .alt-composit{fill:#e0e0e0;border-bottom:1px}#mermaid-svg-brRdcw06nOMjEdAk .state-note{stroke:#aa3;fill:#fff5ad}#mermaid-svg-brRdcw06nOMjEdAk .state-note text{fill:black;stroke:none;font-size:10px}#mermaid-svg-brRdcw06nOMjEdAk .stateLabel .box{stroke:none;stroke-width:0;fill:#ECECFF;opacity:0.7}#mermaid-svg-brRdcw06nOMjEdAk .edgeLabel text{fill:#333}#mermaid-svg-brRdcw06nOMjEdAk .stateLabel text{fill:#000;font-size:10px;font-weight:bold;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-brRdcw06nOMjEdAk .node circle.state-start{fill:black;stroke:black}#mermaid-svg-brRdcw06nOMjEdAk .node circle.state-end{fill:black;stroke:white;stroke-width:1.5}#mermaid-svg-brRdcw06nOMjEdAk #statediagram-barbEnd{fill:#9370db}#mermaid-svg-brRdcw06nOMjEdAk .statediagram-cluster rect{fill:#ECECFF;stroke:#9370db;stroke-width:1px}#mermaid-svg-brRdcw06nOMjEdAk .statediagram-cluster rect.outer{rx:5px;ry:5px}#mermaid-svg-brRdcw06nOMjEdAk .statediagram-state .divider{stroke:#9370db}#mermaid-svg-brRdcw06nOMjEdAk .statediagram-state .title-state{rx:5px;ry:5px}#mermaid-svg-brRdcw06nOMjEdAk .statediagram-cluster.statediagram-cluster .inner{fill:white}#mermaid-svg-brRdcw06nOMjEdAk .statediagram-cluster.statediagram-cluster-alt .inner{fill:#e0e0e0}#mermaid-svg-brRdcw06nOMjEdAk .statediagram-cluster .inner{rx:0;ry:0}#mermaid-svg-brRdcw06nOMjEdAk .statediagram-state rect.basic{rx:5px;ry:5px}#mermaid-svg-brRdcw06nOMjEdAk .statediagram-state rect.divider{stroke-dasharray:10,10;fill:#efefef}#mermaid-svg-brRdcw06nOMjEdAk .note-edge{stroke-dasharray:5}#mermaid-svg-brRdcw06nOMjEdAk .statediagram-note rect{fill:#fff5ad;stroke:#aa3;stroke-width:1px;rx:0;ry:0}:root{--mermaid-font-family: '"trebuchet ms", verdana, arial';--mermaid-font-family: "Comic Sans MS", "Comic Sans", cursive}#mermaid-svg-brRdcw06nOMjEdAk .error-icon{fill:#522}#mermaid-svg-brRdcw06nOMjEdAk .error-text{fill:#522;stroke:#522}#mermaid-svg-brRdcw06nOMjEdAk .edge-thickness-normal{stroke-width:2px}#mermaid-svg-brRdcw06nOMjEdAk .edge-thickness-thick{stroke-width:3.5px}#mermaid-svg-brRdcw06nOMjEdAk .edge-pattern-solid{stroke-dasharray:0}#mermaid-svg-brRdcw06nOMjEdAk .edge-pattern-dashed{stroke-dasharray:3}#mermaid-svg-brRdcw06nOMjEdAk .edge-pattern-dotted{stroke-dasharray:2}#mermaid-svg-brRdcw06nOMjEdAk .marker{fill:#333}#mermaid-svg-brRdcw06nOMjEdAk .marker.cross{stroke:#333}:root { --mermaid-font-family: "trebuchet ms", verdana, arial;}#mermaid-svg-brRdcw06nOMjEdAk {color: rgba(0, 0, 0, 0.75);font: ;}

字符串张三

整数18

小数1.72

Scanner对象

变量与标识符

标识符

用于标记一个数据实体的符号

变量

变化的标识符，就是变量

与我们相关的变量

学校中
生活中
影视剧中