???? ?? ?? Java ??????? ?? ?????. ??? ????? ????, ??? ???? ????, ??? ??? ???? ???? Java? String ??? ???? ????? ???? ??? ?? ?? ?????.

?? ?????? ?? ????? ?? Java ???? ??? ? ??????? ???? ??? ???? ?? ??? ?????.

---

1. equalsIgnoreCase(): ????? ???? ?? ??

• equalsIgnoreCase() ???? ???? ????? ???? ?? ? ???? ??? ? ????.

• ???? ??? ???? ?? ???? ???? ?? ? ??? ?????.

?:

String string = "Hello";
System.out.println(string.equalsIgnoreCase("HeLLo")); // Result: true

---

2. toLowerCase() ? toUpperCase(): ???? ??

???? ?? ??? ?? ???? ???? ?? ???? ???? Java? ?? ?? ?? ???? ?????.

?:

String string = "Hello";
System.out.println(string.toLowerCase()); // Result: hello
System.out.println(string.toUpperCase()); // Result: HELLO

---

3. startWith() ? endWith(): ??? ?? ??

???? ?? ?? ???? ????? ???? ???? ?? ?? ?? ??? ?????.

????? ????? ????? ?? ? ?????.

?:

String string = "Hello";
System.out.println(string.startsWith("h")); // Result: false
System.out.println(string.endsWith("lo")); // Result: true

???? ?? ??

????? ???? ??? ???? ?? ?? ???? ????? ??? ??????

??? Java? ??? ?? ? ???? ??? ?? ???? ????? ?? ???? ??? ?????.

startsWith() ???? ????? ????? ????? ????? ???? ?? ??? ????? toLowerCase() ?? toUpperCase? ???? ???? ?? ???? ?? ??? ????? ????? ???. ().

?? ??? ??? ????.

String givenString = "Example";
String givenCharacterString = "e";
System.out.println(
    givenString.toLowerCase().startsWith(
        givenCharacterString.toLowerCase()
    )
); // Result: true

??:

• startsWith(): ? ???? ???? ??? ?? ???? ????? ????? ????? ?????.

• toLowerCase(): ?? ???? ?? ???? ?? ???? ???? ????? ???? ?? ??? ?????.

? ???? ??? ????? ???? ?? ????? ?? ???? ????? ??? ??? ??? ???? ???? ????? ? ? ????.

---

4. toCharArray(): ???? ?? ??? ??

?? ??? ???? ?? ?? toCharArray() ???? ???? ???? ?? ??? ?? ??? ? ????.

?:

String string = "Hello";
System.out.println(string.equalsIgnoreCase("HeLLo")); // Result: true

??:

Arrays.toString()? ???? [H, e, l, l, o] ???? ?? ??? ??????. System.out.println(string.toCharArray())? ?? ???? ??? ?? ??? Hello?? ???? ?????.

?? println() ???? ?? ?? ??? ?????? ?? ?????.

? ??? ?? ??? ??? ???: Java? ??? ???? ???? ?????.

---

5. charAt(), indexOf() ? lastIndexOf(): ?? ??

??? ??? ??? ??? ?? ??? ?? ? ??? ???.

• charAt(): ???? ??? ???? ?? ??? ?????.

• indexOf(): ??? ??? ?? ????? ????. ???? ??? -1? ?????.

• lastIndexOf(): ??? ??? ????? ????? ????. ???? ??? -1? ?????.

?:

String string = "Hello";
System.out.println(string.toLowerCase()); // Result: hello
System.out.println(string.toUpperCase()); // Result: HELLO

---

6. contain(): ?? ??? ?? ?? ??

???? ?? ?? ???? ???? ??? ????? Contains() ???? ??? ???.

?:

String string = "Hello";
System.out.println(string.startsWith("h")); // Result: false
System.out.println(string.endsWith("lo")); // Result: true

---

7. replacement(): ?? ?? ?? ??? ???

replace() ???? ?? ?? ?? ???? ? ??? ??? ? ?????. ??? ??? ? ??? ?????.

?:

String givenString = "Example";
String givenCharacterString = "e";
System.out.println(
    givenString.toLowerCase().startsWith(
        givenCharacterString.toLowerCase()
    )
); // Result: true

---

8. Split(): ???? ?? ???? ???

split() ???? ?? ??? ???? ???? ?? ??? ???? ????. ??? ???? ?? ???? ? ?????.

?:

String string = "Hello";
System.out.println(
    Arrays.toString(string.toCharArray())
); // Result: [H, e, l, l, o]

---

9. CompareTo(): ???? ?? ??

CompareTo() ???? ? ???? ????? ?????. ???? ? ?? ???, ??? ???, ??? 0? ?????.

?:

String string = "Hello";
System.out.println(string.charAt(0)); // Result: H
System.out.println(string.indexOf('l')); // Result: 2
System.out.println(string.lastIndexOf('l')); // Result: 3

---

10. isBlank() ? isEmpty(): ??? ?? ??

• isBlank(): ???? ?? ??? ??? ??? ?? true? ?????.

• isEmpty(): ???? ??? ?? ??? true? ?????.

?:

String string = "Hello";
System.out.println(string.contains("l")); // Result: true

---

11. match(): ??? ??

matches() ???? ???? ??? ???? ????? ?????. ??? ?? ??? ?? ??? ?????.

?:

String string = "Hello";
System.out.println(string.equalsIgnoreCase("HeLLo")); // Result: true

---

12. Trim(): ?? ?? ??

trim() ???? ????? ?? ? ?? ??? ???? ??? ?? ???? ??? ??? ??? ? ?? ????.

?:

String string = "Hello";
System.out.println(string.toLowerCase()); // Result: hello
System.out.println(string.toUpperCase()); // Result: HELLO

---

??

Java? ???? ?? ??, ?? ???? ??? ? ??? ??? ??? ??? ?? ?????. ??? ??? ????, ??? ???? ????, ??? ?? ???? ???? ??? ??? ??? ?????. ???? ?? ???? ?? ???? Java? ?? ???? ???? ??? ? ?? ??? ??? ?? ??? ???? ??? ?????.

---

?? ???

• ?? ??
• ??? ??? ????
• Java ??? ?? ??
• Java ??? ??
• Java OOP ??
• ?? ????? ??

??? ?????!

? ??? ???: Java-Interview Essentials? ?? ???? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!