Java Blog für Programmierer

JEP Draft für "Raw String Literals" in Java

29.01.2018 · Christian Ullenboom

In der Diskussion ist der „Back-Tick“, sodass es so aussehen würde:

File Paths Example

Traditional String LiteralsRaw String Literals```

Runtime.getRuntime().exec("\"C:\\Program Files\\foo\" bar");

Runtime.getRuntime().exec("C:\Program Files\foo" bar");

### Multi-line Example

Traditional String LiteralsRaw String Literals```
String html = "\n"
              "    \n" +
              "         Hello World.\n" +
              "    \n" +
              "\n";

String html = `

                       Hello World.

              `;

Regular Expression Example

Traditional String LiteralsRaw String Literals```

System.out.println("this".matches("\\w\\w\\w\\w"));

System.out.println("this".matches(\w\w\w\w));

Output:

true

### Polyglot Example

Traditional String LiteralsRaw String Literals```
String script = "function hello() {\n" +
                "   print(\'\"Hello World\"\');\n" +
                "}\n" +
                "\n" +
                "hello();\n";
ScriptEngine engine = new ScriptEngineManager().getEngineByName("js");
Object obj = engine.eval(script);

String script = `function hello() {
                    print('"Hello World"');
                 }

hello();
            `

ScriptEngine engine = new ScriptEngineManager().getEngineByName("js"); Object obj = engine.eval(script);

Output:

"Hello World"

Database Example

Traditional String LiteralsRaw String Literals```

String query = "SELECT EMP_ID, LAST_NAME\n" +

           "FROM EMPLOYEE_TBL\n" +
           "WHERE CITY = 'INDIANAPOLIS'\n" +
           "ORDER BY EMP_ID, LAST_NAME;\n";

String query = SELECT EMP_ID, LAST_NAME FROM EMPLOYEE_TB WHERE CITY = 'INDIANAPOLIS' ORDER BY EMP_ID, LAST_NAME; ;

Ich bin gespannt, ob das in Java 10 kommen wird. Ich dachte schon, dass Java 10 Release wird eher klein, doch zusammen mit den var-Variablen sind das zwei kleine, aber bedeutende Sprachänderungen.

Details unter .

Kategorien: Allgemein, Java 10