高级Kotlin强化实战（二）

• • • • • 2.13 constructor 构造器
        • 2.14 Get Set 构造器
        • 2.15 操作符
        • 2.16 换行

2.13 constructor 构造器

//Java public class Utils { private Utils() {   } public static int getScore(int value) { return 2 * value;   } } 

//Kotlin class Utils private constructor() { companion object { fun getScore(value: Int): Int { return 2 * value     }   } } // 或者 object Utils { fun getScore(value: Int): Int { return 2 * value   } } 

2.14 Get Set 构造器

//Java public class Developer { private String name; private int age; public Developer(String name, int age) { this.name = name; this.age = age; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } } 

//kotlin data class Developer(val name: String, val age: Int) 

2.15 操作符

//Java final int andResult = a & b; final int orResult = a | b; final int xorResult = a ^ b; final int rightShift = a >> 2; final int leftShift = a << 2; final int unsignedRightShift = a >>> 2;  

//kotlin val andResult = a and b val orResult = a or b val xorResult = a xor b val rightShift = a shr 2 val leftShift = a shl 2 val unsignedRightShift = a ushr 2 

2.16 换行

//Java String text = "First Line\n" + "Second Line\n" + "Third Line"; 

//kotlin val text = """ |First Line |Second Line |Third Line """.trimMargin()