return、finally
1.try和catch中有return时,finally先执行
1 public class tryDemo { 2 public static int show() { 3 try { 4 return 1; 5 }finally{ 6 System.out.println("finally模块被执行"); 7 } 8 } 9 public static void main(String args[]) { 10 System.out.println(show()); 11 } 12 } 13 ---------- 14 finally模块被执行 15 1
public class tryDemo { public static int show() { try { int a = 8/0; return 1; }catch (Exception e) { return 2; }finally{ System.out.println("finally模块被执行"); } } public static void main(String args[]) { System.out.println(show()); } } ------------ finally模块被执行 2
2.如果finally也有return,直接return
1 public class tryDemo { 2 public static int show() { 3 try { 4 int a = 8/0; 5 return 1; 6 }catch (Exception e) { 7 return 2; 8 }finally{ 9 System.out.println("finally模块被执行"); 10 return 0; 11 } 12 } 13 public static void main(String args[]) { 14 System.out.println(show()); 15 } 16 } 17 ------------- 18 finally模块被执行 19 0
3.finally中对于返回变量做的改变->会影响最终的返回结果
1 public class Test { 2 public Object show1() { 3 Peo obj = new Peo(); 4 obj.setName("1"); 5 try { 6 System.out.println(obj); 7 return obj; 8 } finally { 9 System.out.println("finally模块被执行"); 10 obj.setName("2"); 11 } 12 } 13 14 public Object show2() { 15 Peo obj = new Peo(); 16 obj.setName("1"); 17 try { 18 System.out.println(obj); 19 return obj; 20 } finally { 21 System.out.println("finally模块被执行"); 22 obj = null; 23 } 24 } 25 26 public Object show3() { 27 Peo obj = new Peo(); 28 obj.setName("1"); 29 try { 30 System.out.println(obj); 31 return obj; 32 } finally { 33 System.out.println("finally模块被执行"); 34 obj = null; 35 return obj; 36 } 37 } 38 39 public static void main(String args[]) { 40 Test test = new Test(); 41 System.out.println(test.show1()); 42 System.out.println("*************"); 43 System.out.println(test.show2()); 44 System.out.println("*************"); 45 System.out.println(test.show3()); 46 } 47 48 class Peo { 49 String name; 50 51 public void setName(String name) { 52 this.name = name; 53 } 54 55 @Override 56 public String toString() { 57 return "Peo [name=" + name + "]"; 58 } 59 } 60 } 61 -------------------- 62 Peo [name=1] 63 finally模块被执行 64 Peo [name=2] 65 ************* 66 Peo [name=1] 67 finally模块被执行 68 Peo [name=1] 69 ************* 70 Peo [name=1] 71 finally模块被执行 72 null
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